英语高手进！！快！！重赏，区分这几个单词

keep 重在『保持某个状态不变』
maintain重在『做某事像以前那样做』
retain 『保持那个样子』

enhance和heighten都是提高的意思，前者指『品质、价值』方面的提高，后者指『程度』方面『变强』

补充：

好吧，给您说详细点儿。

keep:to make sb. or sth. remain in a place or state.
给你举个例子啊：
They kept her in hospital for 3 weeks.
意思是：他们让她住院3周。

maintain：to continue to have or do sth. as before.
给你举个例子：
He maintained his interset in football all his life.
意思是：他对足球的兴趣一生不减。

retiain: to keep or possessino of something
给你举个例子啊：
I can't retain all that information.
意思是：我记不住那么多东西。

第二组

enhance:to increase the quality, value, or beauty of sth.
给你举个例子：
Passing the examination should enhance your chances of getting a job.
通过考试该会增加你找到工作的机会。

heighten:to make or become greater in degree.
给你举个例子：As she waited her excitement heightened.
意思是：她越等心里就越激动。

大人，我已经很认真的写了，哪敢让您的20分打水漂儿啊。

您好！
keep [简明英汉词典]