On top of that, their reproductive cycle is very short.

更有甚者，它们的繁殖周期非常短。

Pollen is part of a plant's reproductive cycle.

花粉是植物繁殖周期的一部分。

This is the normal reproductive cycle.

这是正常的生殖周期。

Also, some people argue that due to their reproductive cycle, jellyfish are actually a sustainable food source.

此外，一些人认为， 由于它们的繁殖周期，水母实际上是一种可持续的食物来源。