慢速英语:An Odyssey of Orchids at the United States Botanic Garden

1.But some orchids that grow naturally are in danger of disappearing from Earth.

in danger of有…的危险

例句：This kind of animal is in danger of becoming extinct.
      这种动物有灭绝的危险。

2.Not all orchids grow from the ground. Some are "air plants" that grow on trees.

Not all部分否定

all，every，both，always等用于否定结构时不是全部被否定，而是表示其中的一部分被否定。而且英语多半将not置于谓语中。

例如：

All is not a gold that glitters.（即Not all that glitters is gold.）
闪闪发光物，未必尽黄金。

Every one cannot write novels.（即Not every one can write novels.）
不是所有的人都能写小说。

I don’t like both of the novels.（即I like only one of the two novels.）
这两本小说我不是都喜欢。

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