adj.無(wú)效的；病弱的

n.病人；殘疾者

vt.退役；遣送回家

A passport that is out of date is invalid. 護(hù)照過(guò)期是無(wú)效的。

Unless a check is signed, it is invalid. 支票除非簽了名，否則是無(wú)效的。

She looks after her invalid mother. 她照看病弱的母親。

He never fully recovered, and had to spend the rest of his life as an invalid. 他沒(méi)能完全康復(fù)，于是不得不成了一名殘疾者度過(guò)余生。

He was invalided out of the army because of the wounds he received. 他因負(fù)傷而退役。

Ambassador decided that he must invalid his sick radio-officer home. 大使決定把患病的無(wú)線電報(bào)員遣送回國(guó)。