he was also the first chinese pianist in the 70_year shistory of the competition to win this prize.
题目
he was also the first chinese pianist in the 70_year shistory of the competition to win this prize.
中间为i什么是70—year而不是70years
答案
这里70-year作为形容词修饰后面的history
而分开的70 year只能作时间名词,不能修饰另一个名词
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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