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Most students today are aware of the enviromental challenges

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Most students today are aware of the enviromental challenges facing our planet.这里为什么用facing
Most students today are aware of the enviromental challenges
facing our planet是动名词形式做后置定语,修饰enviromental challenges.整句话可以当一个省略句,即:Most students today are aware of the enviromental challenges which face our planet.和原句意思一样.