They're polymers, made of long chains of repeating chemical units.

它们是聚合物，由长链重复的化学单元组成。

It's a polymer, meaning it's made of long chains of repeating units of atoms strung together.

它是一个聚合物，说明它是由一长串相同的原子而成。

These are all polymers; huge chains or sometimes 3D networks of repeating organic units called monomers.

这些都是聚合物； 巨大的链条或有时称为单体的重复有机单元的 3D 网络。