作用的英语翻译是：affect; effect; intention; action; motive; operation。
例句：
1、失业对我国的经济起着破坏作用。
Unemployment is having a corrosive effect on our economy.
2、她在争论中起着举足轻重的作用。
She played a key role in the dispute.
3、电子学描述的是电力产生的作用。
The term electronics refers to electrically induced action.
4、这镜子能照人，但也有装饰作用。
The mirror is functional yet decorative.
5、我们曾告诫过他们，但没起任何作用。
We warned them, but to no effect.
6、摩擦力作用于运动着的物体，并使其停止。Friction acts on moving bodies and brings them to a stop.
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