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.
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.
他像脆弱的花儿那样虚弱。
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