one of的几种用法：
of +代词宾格或名词复数
如：one of them
one of the students
of 短语做主语，谓语动词用单数
One of them is good at math.
of +the+形容词最高级+名词复数
one of the longest rivers
one of例句：
I bought one of the leading brands.
我买了几个畅销品牌中的一种。
I heard a playback of one of the tapes.
我听到了其中一盘录音带的回放。
I had made arrangements for my affairs to be dealt with by one of my children
我已经安排我的.一个孩子处理我的事务。
One of the bags was lost en route.
其中一个包在途中丢失了。
I think that is one of the major ingredients in his success.
我认为那是他成功的主要因素之一。
