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Sischo works with some of the rarest endangered species on the planet, kāhuli — Hawaii's native tree snails. The colorful, jewel-like snails were once so abundant. It's said they were like Christmas ornaments covering the trees. Almost all of the 750 different species were found only in Hawaii. Today, more than half of those species are gone, the extinctions happening in the span of a human lifetime. Sischo and his team with Hawaii' s Department of Land and Natural Resources have the heavy task of saving what's left.

To stave off extinction, 40 species of snails, each about the size of a dime, live in human care inside an unremarkable trailer near Honolulu. For some, it's the only place where they' re found, their wild populations having completely disappeared. "Most people, when they think endangered species going extinct, they think of pandas and tigers and elephants, but imagine having 40 different species that are all as rare as pandas are," Sischo says.

This winter, one species of snail will inch toward an auspicious milestone. It will be released in a special enclosure in the mountains of Oahu, one that has been painstakingly prepared to give the snails the best chance of survival in their natural environment.

Still, the outlook for Hawaii's snails is uncertain, symbolizing a new era in the conservation of endangered species. Around the world, plants and animals are being brought into enclosure as a last-ditch effort against extinction. But as the climate heats up and invasive species continue to spread, many have no clear path to return to nature in the near term. That could mean they stay in human care. In the face of the biodiversity crisis, many wildlife biologists say there's no other choice. "These are biological treasures that are irreplaceable," Sisch o says. "It is now or never. What we manage to keep on Earth will be what the next generation is able to put back."

Museum of Bad Art(Boston, Massachusetts)

The mission of MOBA is to collect, exhibit and celebrate art that will be shown in no other venue. Highlights include Lucy in the Field with Flowers, a painting found in 1993 leaning against a trash barrel, waiting for garbage collection. This painting was the first of the MOBA collection. A low point and a must-see — is the painting Our Lady or Perpetual Housework.

The Mob Museum (Las Vegas, Nevada)

This 1933 former U. S. post office and federal courtroom was bought by the city of Las Vegas in 2002 for $1, with the condition it be used for something cultural, like a museum. Officially the National Museum of Organized Crime and Law Enforcement, this museum tells a visual story of the war between the mob and the police. The museum ends its tour by inviting you into a fully operational — and legal — speakeasy.

International Tennis Hall of Fame (Newport, Rhode island)

This museum was built on the site of the first United States National Lawn Tennis Championships in1881(which grew into the U. S. Open in New York). A highlight is a Kings Court for "court tennis," first played by monks and kings dating back to 1538. In this ancient game, the ball can bounce off the walls and windows and still be in play. There are only 10 such courts in North America, as they cost approximately $3 million to make.

1. 给出建议（如：认真听课，积累词汇以及多用英语交流，利用课余时间听英文歌曲等）；

2. 注意：

(1) 词数80左右；

(2) 可适当增加细节，以使行文连贯。

Dear Li Mei,

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Yours sincerely,

Li Hua