桨常可起舵的作用.用英语怎么说？

桨常可起舵的作用.

An oar often acts as rudder.

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

oar

n. 桨，橹，划手；vi. 划（行）；

例句
The blade of the oar had entangled itself with something in the water.
船桨的桨叶和水里的什么东西缠住了。

often

adv. 常常，经常，时常，再三；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

acts

n. 行为( act的名词复数 )，动作，（一）幕，（搭档）演出短节目的演员；v. 行动( act的第三人称单数 )，做，表演，起作用；

例句
He's taking a dangerous drug: it acts very fast on the central nervous system...
他正在服用一种危险的药物：这种药物能很快影响到中枢神经系统。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

rudder

n. 船舵，[航]方向舵，[动]尾羽，指导人；

例句
It was not yet clear how the rudder had sheared off.
还不清楚船舵是如何断裂的。