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A battery(电池)can be made out of(由……做成)a potato.A snail(蜗牛)can sleep for three years.In the future,you may take a space elevator(太空电梯).It goes thousands of kilometers above the Earth.Hummingbirds(蜂鸟)cannot walk.
A battery (can be made out of) a potato.A snail (snail) can sleep for three years.In the future, you may take a space elevator .It goes thousands of kilometers above the Earth.Hummingbirds (hummingbird) can not walk.