Make sb weak
虚弱───weak;使───send
His weak voice was almost inaudible.───他声音微弱得几乎听不到。
She was too weak to stand.───她虚弱得站都站不住。
She was born with a weak heart.───她生来就有一个衰弱的心脏。
She was forced to pause; she was seized by a dry cough, her breath came from her weak and narrow chest like the death-rattle.───她不得不停下来，一阵干咳堵住了她的嗓子，从她那狭小瘦弱的胸口里传出一串咯咯的喘气声。
She is too weak to stand on her feet because she had been operated on twice for that illness.───她因为那病开过两次刀，身体十分虚弱，几乎站不起来。
Amplifiers are devices which take a relatively weak signal as an input and produce a much stronger signal as an output.───放大器是一种作为输入设备接受相对较弱的信号然后作为输出设备向外输出一个较强讯号的设备。
Everybody has some weak spot.
John is good at French but weak at history.
He was a weak little mouse of a man.
The child's pulse was strong/weak.
To be angry with a weak man is a proof that you are not very strong yourself.