When an end is lawful and obligatory,the indispensable means to is are also lawful and obligatory .(
题目
When an end is lawful and obligatory,the indispensable means to is are also lawful and obligatory .(Abraham Lincoln ,American statesman)
如果一个目的是正当而必须做的,则达到这个目的的必要手段也是正当而必须采取的.(美国政治家 林肯.A.)
后半句怎么理解?尤其是is和are?
答案
is 应该是it吧?是不是看错了?
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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