单词：water engineering
water engineering的用法和样例：
例句
- We have also built150small water conservancy works.我们还修建了一百五十项小型水利工程。
- Now we have to rebuild the existing water conservation facilities and dig wells in some places.现在要考虑对原来的水利工程进行修补，有的地方要打一点井。
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