雅思写作常用词汇：维系生命的

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　　life-sustaining

　　-eg: Water is life-sustaining, however, it is contaminated by th epollution discharged by chemical factories.;

　　preserve/protect/conserve

　　-eg: Its the compelling responsibility of every one to preserve the envirnment.

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[雅思英语写作] 雅思写作常用词汇：维系生命的