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1.One recent day, he slowly climbed up a giant sequoia in California's Sierra Nevada Mountains.
climb up向上爬，攀登
Who would have expected that he could climb up that steep cliff?
这么陡的峭壁,谁知他竟爬上去了。
2.The Sierra Nevada range once had plenty of water because of mountain streams.
plenty of很多，大量的
She is in the fortunate position of having plenty of choice.
好在她有很多选择。
3.One possible solution would be to cut down less important tree species because other plants compete with the sequoias for water.
cut down砍倒
A vandal with a chainsaw cut down a tree.
一个故意破坏公物的人用链锯伐倒了一棵树。
