exist短语搭配
exist in vt. 存在于；
exist as 以…形式(或形态)存在，作为…而存在 ；
exist on 靠…生存；靠…生活
Research opportunities exist in a wide range of areas.
研究机会存在于广泛的领域中。
Such a hierarchy may also exist in plants.
这种等级结构也可能存在于植物中。
If society is to exist as a unity, its members must have shared values.
社会若要成为一个统一的群体，它的成员就必须有共同的价值观。
They can\'t exist on the money he\'s earning.
他们靠他挣的那点钱无法维持生活。
Some people exist on melons or coconuts for weeks at a time.