interfere,intervene

interfere:
vi.
1. 妨碍;冲突;抵触[(+with)]
I turned down the radio lest it should interfere with his lessons.
我把收音机音量调低以免妨碍他做功课。
2. 介入;干涉,干预[(+with/in)]
We have no right to interfere in the internal affairs of other countries.
我们没有权利干涉别国内政。
She wished he wouldn't interfere.
她希望他不要干预。
3. 【婉】污辱,性骚扰[(+with)]
intervene:
vi.
1. 插进;介入;介于中间[(+between)]
Five years has intervened since he last saw Daisy.
自从他上一次见到黛西以来,五年过去了。
2. 干涉,干预;调停[(in/between)]
They were about to fight when their father intervened.
他们的父亲出来调停时,他们已经快要打起来了。
The Bank of England had been intervening in foreign exchange markets.
英格兰银行对外汇市场进行了干预。
3. 干扰,阻扰;打扰
I shall leave on Sunday if nothing intervenes.
若无什么事情发生的话,我将于星期天动身。

interfere是贬义或者中性词；intervene是中性或者褒义词。

 

引用自：http://blog.sina.com.cn/s/blog_4a69e6f7010082ea.html