Through every stage of a plant's life cycle, hormones are chatty and messy.

在植物生命周期的每一个阶段，激素总是喋喋不休的。

It's involved with nearly every aspect of the plant's life cycle, from its birth… to its death!

它几乎涉及植物生命周期的每一个方面，从它的诞生… … 到它的死亡！

Pollen is part of a plant's reproductive cycle.

花粉是植物繁殖周期的一部分。

Within 35,000 years, the plant cycle removes the last traces of lead left by the Industrial Revolution from Earth's soil, and it may take up to 65,000 years beyond that for CO2 to return pre-human levels.

三万五千年年以内，植物循环将从地球土壤中清除工业革命留下的铅的最后痕迹，而二氧化碳可能需要六万五千年才能恢复到人类出现之前的水平。

Their remains have been found throughout the Northern Hemisphere, but they're especially common in North America, where fossilized roots, trunks, and leaves have been found from almost every stage of the plant's life cycle.

它们的遗骸在整个北半球都有发现，但它们在北美尤为常见，那里几乎在植物生命周期的每个阶段都发现了根、树干和叶子的化石。