例句:
Among all the stuff,the only one who doesn't obey the rule is your son.在所有职员中,唯一一个不遵守规则的就是你的儿子.
Among these people was his friend Jim。 他的朋友吉姆就在这些人当中。 
among用作介词,表示在...中在...之间处在...中
如:
It's quite a pleasure to walk among the trees in the evening.傍晚时分在林子里走走是很惬意的事。
He was sitting among a group of children, telling them a story.他正坐在一群孩子中间讲故事
among放在句首的用法就近原则
among, between
among 三者或三者以上之间
between 两者之间,三者或三者以上两两之间, Switzerland lies between France, Germany, Australia and Italy.
用法
1、among主要用于三者或三者以上,其宾语通常是表示笼统数量或具有复数意义的名词或代词。
2、among有时相当于one of, 即“…当中的一个”。among还可引出形容词最高级的比较范围,但须注意最高级形式出现在among之前或之后意义有所不同。
3、among只接复数名词、表人集体名词、复数意义的代词
4、用作介词,表示在...中在...之间处在...中