这些动词都表示对一种需要的完成、努力的促进或一个目的或目标的取得起一份作用。
These verbs mean to contribute to the fulfillment of a need, the furtherance of an effort, or the achievement of a purpose or end.
把它们掺和在一起，并不像你想的那样好。因为一份最新的研究表明，某些维生素会阻碍运动发挥作用。
Put them together and it's not as good as you'd think. Because a recent study shows that some vitamins block the beneficial effects of exercise.
一份新的报道显示，哈欠能够帮助大脑保持凉爽，鼻窦在这个过程中所起的作用就像是风箱。
Yawning helps keep the brain cool, and the sinuses play a role in that process by acting as bellows, a new report suggests.
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