下面就是新东方在线雅思频道为大家收集整理的雅思写作常用词汇：维系生命的，供大家参考。更多雅思报名官网的最新消息，最新、最专业的雅思备考资料，新东方在线雅思频道将第一时间为大家发布。

　　life-sustaining[维系生命的]

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

　　preserve[保存/保护]/protect/conserve

　　-eg: It's the compelling responsibility of every one to preserve the envirnment.