用作定语
▲～+n.
He is a very influential man in the government.他在政府中是个很有影响的人物。
He had the support of a powerful and influential politician.他得到一个有权势的政客的支持。
They set up an influential committee to advise workers on how to economize in food.他们成立一个强有力的委员会来劝告工人们节约用粮。
用作表语
▲S+be+～+prep.-phrase
You are the leader and only you can be influential in the decision.你是领导,只有你才能对这决定有影响。
The fact is influential in reaching a decision.这一因素对作出决定是有影响的。

［同义词］   controlling, dominant, leading
［反义词］   ineffectual, powerless, weak