a chronic alcoholic, invalid, etc
长期酗酒的、 病弱的等.
She looks after her invalid mother.
她照看病弱的母亲。
She was the solitary companion of a sick father.
她是病弱的父亲的唯一伴侣。
To make(bacteria or viruses) less virulent.
使病毒减弱减弱（细菌或真菌）的毒性
our invalid mother
我们体弱多病的母亲
a long, enervating illness
长期而使人衰弱的病.
a case of steroid-induced weakness.
促发类固醇虚弱的病例。
The sick man's strength is on the wane.
病人的体力越来越弱。
His illness has left him weak.
他的病使他身体衰弱了。
The sick man's heart was failing.
病人的心脏渐渐衰弱。
He is pretty much pulled down by his illness.
疾病使他的身体很虚弱。
A disease that gradually weakens or wastes the body.
消耗病使身体逐渐衰弱或消瘦的疾病
A bodily ailment or weakness, especially one brought on by old age.
虚弱身体上的疾病或虚弱，尤指老龄带来的
Not ailing, infirm, or diseased; healthy.
健康的没病的、非体弱的或没得病的；健康的
of or relating to or characteristic of a person who is a valetudinarian.
属于、关于或有体弱多病的人的特征。
His recent illness has shorn him of strength.
他最近的一场病使他的体力大为减弱。
His weak chest is a legacy of a childhood illness
他那瘦弱的胸脯是儿时患病的後遗症
His weak chest was a legacy of a childhood illness.
他那瘦弱的胸脯是儿时患病的后遗症。