解铃还需系铃人英语怎么说?
题目
解铃还需系铃人英语怎么说?
答案
1.It's better for the doer to undo what he has done.
2.Let him who tied the bell on the tiger take it off.
3.Whoever started the trouble should end it.
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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