因此，这两个因素都会影响周期；而实际上，周期似乎是由这两个因素的结合产生的。

Thus both factors can affect the cycle, which, in practice, seems to be generated by conjunction of the two factors.

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风是由热空气上升产生真空而引起的空气流动。

Wind is a current of air caused by a vacuum caused by hot air rising.

《柯林斯英汉双解大词典》

雷电是由闪电产生的冲击波，它被认为是引发暴雨的原因，而暴雨是风暴的典型特征。

Thunder, the shock wave that comes from a lightning flash, is thought to be the trigger for the torrential rain that is typical of storms.

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Now you can begin to see the kinds of errors that this method might produce because people forget, they can't remember exactly how much they ate of things, or they may not be willing to disclose everything they ate.

现在你就可以明白各种误差,是由人们的遗忘而产生的,他们无法准确记得吃了多少东西,他们不会透露所有自己吃的东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选