鸡蛋有两个作用。蛋清有助于蛋糕发酵，而蛋黄则使蛋糕口感丝滑。

Eggs serve two purposes. The whites help the cake to rise, while the yolks give it a creamy texture.

youdao

策略文档有两个作用。

Policy documents serve two functions.

youdao

点火系统的分电器有两个作用。

The ignition distributor has two jobs.

youdao

Something that takes two inputs, a left operant - and a right operant and it just returns a Boolean value is-- or rather it returns a left to right value.

它有两个输入，一个是左边的作用物,一个是右边的作用物，然后返回一个布尔值-,或者更确切地说，返回一个从左到右的值。

哈佛公开课 - 计算机科学课程节选

And a sigma bond forms any time you have two orbitals coming together and interacting on that internuclear axis.

当你把两个轨道合在一起,并在核间轴上有相互作用时,就形成了sigma键。

麻省理工公开课 - 化学原理课程节选

If the two forces don't cancel, you have a net force.

如果这两个力没有抵消,便会有一个净作用力

耶鲁公开课 - 基础物理课程节选