I know that the cycle of life has a beginning and an end.

我知道生命的轮回既然开始终会结束。

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The cycle of life brings even huge stars to dust, as highlighted by a newly released picture of the supernova remnant G54.1 0.3.

再巨大的星辰也逃不过生命的循环，终有一日会变为尘埃，公布于2010年3月29日照片中的超新星残骸g54.1.0.3非常好的说明了这一现象。

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My fingers were digging in the rich soil, pulling up the plants and brushing off the dirt to return to the cycle of life and death in my garden.

我的手指在肥沃的土壤里挖掘，拔出菜，去掉上面的泥土，在菜园中回到生死循环之中。

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The life cycle of the plant depends on the amount of daylight.

VOA: special.2010.06.29

This picture here, we're going to come back to this later in two weeks when we start talking about vaccines, and we're going to talk about how you make vaccines for viruses and so in doing that we're going to think about the life cycle of a virus.

看这幅图片,我们两周之内还会讲到这一内容,在开讲疫苗的时候,我们要讲讲怎么制作病毒疫苗,那时我们要,讲讲病毒的生命周期

耶鲁公开课 - 生物医学工程探索课程节选

The independent group certifies products and services as environmentally friendly through a life-cycle evaluation - looking at the raw materials and the manufacturing process, transportation and recycling of old products.

VOA: standard.2009.03.30

Yet the progressive economic policy-making coming out of Washington today rests on the futile attempt to escape the corporate cycle of life that lies at the heart of capitalism.

FORBES: Polaroid, Kodak, Apple: No One Escapes the Winds of Creative Destruction

The life cycle of the LED has also increased significantly, going beyond the life cycle of the (AC to DC) converter.

WSJ: Seoul Semiconductor's LED-Lighted Path

That value can certainly multiply over the course of the life cycle of the company, but this is why founders try to start companies with their own funds to avoid diluting their stake.

FORBES: The Dirty Little Secret About Cashing In As An Entrepreneur