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Developed by a team of WSU researchers, the robots' tininess largely relies on a material known as a shape memory alloy (合金) . Although shape memory alloys change form when heated, they can "remember" their original shapes and return to them after cooling. Because of this, the two micro-robots do not require standard motors, and they use light and small ones instead of bulky moving parts.

Both the robots'motors are each made up of two shape memory alloys, allowing them to move their fins as fast as 40 times a second while also lifting over 150 times their weight. "They're very technologically sound. The development of the very lightweight robots opens up new possibilities in micro-robotics," said Conor Trygstad, a material engineering PhD student and study lead author. "Although the robots are impressive when compared to other robots, the pair still fall behind their biological relatives'," Trygstad said. They can currently move at a speed of about six millimeters a second; a water strider, by comparison, speeds along at about a meter per second. For now, the robots also require wired (连线的) power sources, thus seriously preventing any real-world applications for the moment.

Going forward, however, the team plans to copy other small insect species while also creating a new water strider robot which can move at a higher speed. Depending on using small batteries could also greatly increase the robots' areas of use, If the breakthrough designs continue improving, similar micro-robots could one day be employed to monitor hard-to-reach dangerous environments.

African forest elephants help lessen climate change by increasing carbon storage in their forest habitats, meaning they help remove heat-trapping CO₂ from the atmosphere. They do this by influencing the forest structure, including by increasing the diversity and abundance of plant species. It's estimated that one forest elephant can increase the net carbon capture (捕获) capacity of the forest by almost 250 acres. This is equal to removing from the atmosphere a year's worth of emissions (排放量) from 2,047 cars.

"As strange as it seems, all that eating and destruction help the forest pull more carbon out of the air," says Alison Pearce Stevens in the book Animal Climate Heroes! . Elephants eat more than 400 pounds of food a day, so they spend a lot of time searching for food. As they walk through the forest, they do a lot of damage to the surrounding smaller trees, leading to the survival of trees that have the ability to absorb and store more CO₂.

In addition, their thirst for fruits also helps to promote forest growth. This is because elephants disperse fruit seeds. In other words, the seeds pass through the elephant bodies until they drop back to the forest floor.

But African forest elephants are seriously endangered and continue to face threats. These mainly come from hunting for the illegal international trade in elephant ivory (象牙), but also from habitat loss and fewer food sources. The number of forest elephants fell by more than 86% over a period of 31 years, and their habitats are thought to have reduced by 75%. Protecting forest elephants and the forests they depend on means we are safeguarding their ecological contributions that we all rely on.

Kanazawa is living proof (证明) that you're never too old to hit the gym and achieve the body you've always dreamed of. A champion bodybuilder in his youth, Kanazawa stopped exercising completely after he retired at age 34, drinking, smoking and eating whatever he liked. It wasn't until he turned 50 that he got his motivation to regain the perfect body of his younger years.

Kanazawa's wife felt sick frequently, and the former bodybuilder remembered that she had never been happier than when he won the national championship. So to please her, he decided to return to the gym and completely change his diet.

His workout schedule had to be adjusted to his age as well. In his youth, he would spend up to six hours training in the gym every day, and his body would recover within two days after a particularly intensive (强化的) workout, but that was not the case anymore. He cut the daily gym time to three hours and started giving his body one week to recover after exercising every muscle group.

Kanazawa's efforts paid off. In 2016, at the age of 80, Kanazawa defeated many opponents and placed sixth in the world in a contest for bodybuilders over 65, and won the admiration of the crowd.

Sport keeps this elderly man healthy, as he claims not to have suffered so much as a cold since he started bodybuilding again at age 50.

"I want to be a super old man in the bodybuilder community," Kanazawa said, "If I have a goal, I can continue moving forward. I have to work much harder."

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One afternoon, Tom's father brought home five healthy Rhode Island Red chickens and presented them to Tom. "If you take good care of them," his father explained, "I'll buy all the eggs they lay at market price. But remember, you're responsible for buying their feed." Thrilled at the opportunity to earn his own money, Tom immediately agreed, his mind already racing with plans for his new "business".

For the first few weeks, Tom was the picture of dedication. Every morning before school, he would carefully measure out the chickens' feed — a nutritious blend of grains and seeds recommended by the local feed store. He made sure their water was always fresh and their cage clean. The chickens, well cared for, rewarded his efforts with a steady supply of eggs—four or five each day. Tom would collect them in a small basket, and his father would pay him a fair price. Proud of his earnings, Tom started dreaming bigger. He made plans for a larger cage and even researched how to raise more chickens to increase his profits.

But as the weeks passed, Tom noticed something unsettling. The number of eggs began to drop — first to three a day, then two, and sometimes even just one. Maybe the chickens were just having an off week, he thought. But when the trend continued, worry set in. He examined each chicken carefully, checking for signs of illness or stress, but they seemed perfectly healthy. Confused and frustrated, he finally approached his father one evening after dinner.

His father listened quietly, then asked, "Think about it — have you changed anything in how you care for them?" Tom hesitated. Then it hit him. A few weeks earlier, he had decided to cut costs by switching to cheaper feed and reducing the portions slightly. He'd figured the chickens wouldn't notice, and the savings would add up. But now, his attempt to save a few dollars had backfired.

注意：

1．续写词数应为150左右；

2．请按如下格式在答题卡的相应位置作答。

A wave of guilt washing over him, Tom determined to make things right.

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Within a week, Tom noticed a change.

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1．活动内容；

2．活动意义。

注意：

1．词数：80左右；

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Dear Tom,

I hope this email finds you well!

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Yours,

Li Hua

Shan Xinghua is a remarkable figure in the development of China's railway ticketing system. She is known as the "Super Brain" behind 12306, world's largest real-time ticketing platform.

Shan began her career in 1996, she joined a newly formed research team tasked with creating a unified national ticketing system. Back then, the task was extremely (challenge). They had limited resources and the technology was not as advanced as it is today., Shan Xinghua and her team were determined to overcome these difficulties. They spent countless hours analyzing the problems and looking for (solution).

During the early years of 12306, the system faced a lot of issues, especially during the peak travel seasons like the Spring Festival travel rush. The system often crashed owing to a large number of people (try) to access it at the same time. But Shan Xinghua didn't give up. She (lead) her team in exploring advanced technologies and finally they made a breakthrough.

Thanks to their efforts, the 12306 platform (become) far more efficient and user-friendly in the past decade. People can now easily book tickets, choose seats, and even take advantage new functions, such as combined air and rail tickets. Shan Xinghua's journey serves as a powerful reminder of creativity and determination can contribute to great achievements.