能够发出声音的往往是昆虫幼虫，它们生活在陆地上，在空气中制造出声音，而不是像这种蝌蚪一样在水下发出声音。
Those that do tend to be insect larvae, which live on land, making their sounds into the air rather than underwater.
今天，我们的空气和水资源更加洁净，污染已大大减少，全美各地的人们生活在更健康的环境中。
Today, our air and water are cleaner, pollutionhas been greatly reduced, and Americans everywhere are living in ahealthier environment.
土地是一个基本要素的人的生活，人们不应该生活在空气中。
Land is an essential element for people to live, people should not live in the air.
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