Which scientist discovered that objects in water are lifted up by a force that helps them float
题目
Which scientist discovered that objects in water are lifted up by a force that helps them float
这句话中的两个 that 的含义和区别
答案
语法上,第一个是宾语从句的关联词,第二个是定语从句中的关联词.
意义上,第一个无实义,就是分开主句和宾语从句,表示“discover”的内容.第二个that引导的定语从句修饰"a force",相当于“the force”.
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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