体弱的英文：
debility

The state of being weak or feeble;infirmity.
衰弱虚弱或无力的状态;体弱

Not ailing,infirm,or diseased;healthy.
健康的没病的、非体弱的或没得病的;健康的

Poor health is a necessary result of over-exertion.
体弱是过度劳累的必然结果。

It is difficult to dissociate weakness from old age
把年迈与体弱分开是困难的。

Chronically ailing;sickly.
体弱的慢性疼痛的;易生病的

The strong struck down the weak, the ragged spat on the naked.
强壮的击倒了体弱的；衣衫褴褛的唾骂一丝不挂的。

The strong struck down the weak, the ragged spat on the naked
强壮的击倒了体弱的;衣衫褴褛的唾骂一丝不挂的。

Her health was weak. The change might do her harm
她身体弱，这种变化可以能她不好。

Don't set him the task. For one thing he's old; for another he's in poor health.
不能让他去干， 一则年纪大，二则身体弱。

Having inherited from his mother an exceeding delicacy of constitution, he was sent to the care of his uncle in Vermont
由于母亲的遗传，他自幼体弱，他被送到佛蒙特州由他伯父照顾。

After her long illness she is suffering from general debility.
久病之后，她全身虚弱。

After her operation she suffered from general debility.
她在手术后感到全身虚弱.

Heatstroke： Debility caused by exposure to heat and humidity, usually for many hours, called sunstroke when caused by direct sunlight.
中暑:因曝露在湿热环境下(通常是连续好几个小时)而引起的身体虚脱现象，直接受日晒引起的中暑称为日射病。