Menstruation is really just a very normal body life cycle.

月经其实只是一个非常正常的身期。

Jellyfish have a complex and interesting life cycle.

水母的存期既复杂又有趣。

Which means starting from entire life cycle of onboarding.

这意味着从入职的整个期就要开始。

Where do most plants start their life cycle?

大部分植物的期大多从哪里开始？

But Maria explained and painted their life cycle.

但玛丽亚做出了阐释并绘制了它们的期。

The juvenile then starts the jellyfish's life cycle all over again.

回期，重开始期。

Like butterflies, Turritopsis morph through multiple stages during their life cycle.

和蝴蝶一样，水母在期的不同阶段有不同的变。

Like other jellyfish, T. dohrnii goes through a two-part life cycle.

和其他水母一样，灯塔水母的期由两部分组成。

She's just coming over to study the life cycle of silkworms.

她只是过来跟我一起研究蚕的期。

Later, their life cycle experiments will be conducted to obtain space seeds.

后续还将完成拟南芥和水稻在空间“从种子种子”全期的实验，以获得太空种子。

D) Studying the full life cycle of the enzyme as the first step.

D）研究酶的整个期作为第一步。

Life cycle is the series of changes something goes through from birth to death.

期是事物从出死亡所经历的一系列变化。

When large mammals like grizzlies are hunted, evolution might select for speedier life cycles.

当灰熊这种大型哺乳动物被猎杀时，进化可能会选择更快的期。

Their stems dying and reborn in a life cycle that renders them essentially immortal.

它们的茎在期中死亡又重，基本上使它们不朽。

And that time is quite critical at this particular period of their life cycle.

在它们期的这个特定时期，这段时间是相当关键的。

The latest data from Gaia sparked a discovery in a star's life cycle.

盖亚的最数据引发了恒星期中的发现。

These elements exploded into space at the end of the stars' life cycles.

这些元素在恒星期结束时爆炸进入太空。

But they have a much shorter life cycle and stay alive in two ways.

但它们的期更短，只有2种存活方式。

Scientists wonder if the life cycle of stars is the same in these distant regions.

科学家们猜想在这些遥远的区域，恒星过程是否也是一样的。

In a 2018 study, scientists hypothesized that civilizations could even have fossil fuel-driven life cycles.

在 2018 年的一项研究中，科学家们假设文明甚至能以化石燃料来驱动期。