Insects propagate themselves by means of eggs.是什么意思？

Insects propagate themselves by means of eggs.

昆虫以产卵繁殖后代.

insects

n. 昆虫( insect的名词复数 )，虫类；

例句
Flowers are designed to attract insects which then carry the pollen from plant to plant...
花的作用在于吸引昆虫，然后昆虫再将花粉传到其他植株上。

propagate

vt. 繁衍，增殖，使遗传，扩散，使蔓延；vi. 繁殖，扩大，[物] 通过媒介传送；

例句
The easiest way to propagate a vine is to take hardwood cuttings...
栽培葡萄最简便的方法就是硬条扦插。

themselves

pron. 他[她，它]们自己，他们亲自，“himself”的复数，“herself”的复数；

例句
Most officers and men acquitted themselves well throughout the action.
大多数军官及士兵在整个战斗中表现出色。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

means

n. 方法（ mean的名词复数），手段，收入，财

例句
Aggression is by no means a male-only trait.
好斗性绝非男性才具有的特征。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

eggs

n. 卵( egg的名词复数 )，蛋，卵子，卵细胞；

例句
Place the eggs and sugar in a large basin.
把鸡蛋和糖放在一个大碗里。