Pain acts as a natural defence mechanism.

疼痛算是一种自然防护机制的作用。

《牛津词典》

The satellite acts as a drag on the shuttle.

卫星是对航天飞机发展的阻碍。

《柯林斯英汉双解大词典》

The teacher acts as a facilitator of learning.

教师是学习的诱导者。

《牛津词典》

Under this theory, the superego acts as a restraint.

VOA: special.2010.04.13

We have a weight on the piston, and that weight is chosen so that p2 it acts as though p external is equal to p2.

让活塞上放一重物，让它的效果刚好,等同于外压强。

麻省理工公开课 - 热力学与动力学课程节选

Their waste then acts as a cover.

VOA: special.2010.07.13

It also acts as a liaison between the Malaysian National Commission for UNESCO (NATCOM) and UNESCO.

UNESCO: Background

The experience includes the Encampmment, which acts as a home base with point values.

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The nonprofit acts as a conduit between Afghan weavers in remote villages and U.S. rug buyers.

FORBES: Buy a Rug, Educate a Girl