little is done to make dirty water clean before it goes into the river,in some big city.怎么翻译
题目
little is done to make dirty water clean before it goes into the river,in some big city.怎么翻译
答案
little is done to make dirty water clean before it goes into the river,in some big city.怎么翻译
中文意思是:
一些大城市在先要把污水清洁後才回流到河里这项工作完全未有尽力.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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