雅思写作常用词汇：维系生命的
发布时间：2016-02-29 编辑：查字典英语网小编
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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