力矩的

It is really easy, isnt it?

真的很容易，是吗？

This stage is divided into three periods, unfortunate childhood, sweet amativeness and early marriage, and then sums up the formation of early love .

埃莉诺。罗斯福及其生活的时代背景；归纳和总结国内外相关的研究成果；介绍本文的研究方法和目标。