关于英语环保作文,我想问下这个表述对吗?
题目
关于英语环保作文,我想问下这个表述对吗?
Protecting environment is a world-class difficult problem.这里用world-class difficult problem 是否正确?
答案
不太好.供参考
It is difficult to protect the environment across the world.
How to protect the environment has become a world wide headache.
Protecting the environment is a difficult problem for the world.
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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