Optical fiber is a glass waveguide which is normally as thin as human hair.

光纤是一种玻璃波导，通常和人的头发一样细。

youdao

The thin, human evil, rain sent flowers to drop at dusk.

世情薄，人情恶，雨送黄昏花易落。

youdao

It's very very thin, say, probably about a size of a hair, okay, a human hair.

它非常薄，大概和头发差不多大小，人的头发。

youdao

It's very very thin, say, probably about a size of a hair, okay, a human hair.

它非常薄，大概和头发差不多大小，人的头发。

youdao