身体的免疫系统变得如此脆弱，以至于人们经常因为轻微的疾病而变得非常虚弱。

So weak does the body's immune system become that the person often becomes very ill from usually mild sicknesses.

youdao

你必须有一个信念，相信无论何时你感到脆弱，失去动力，虚弱或者只是怀疑时，你都会走得出来。

You must have a belief that you can go to whenever you feel fragile, unmotivated, weak or simply in doubt.

youdao

暴雨中衣着单薄的她看起来是那么地虚弱那么地脆弱。

She looked weak and fragile in the harsh rain, wearing not enough to keep her warm.

youdao