“以免影响”的英文怎么说？

In order to avoid...

In case of any effect/disturbance

....or it will affects sb. to do sth.
另外你可以结合文章的具体意思来翻译，比如：
He didn't want to say anything to influence my decision
他不想多说什么，以免影响我的决定。

to avoid impact on...
lest for influence...