adj.無效的；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A passport that is out of date is invalid.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)照過期是無效的。

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

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

Nobody looks after the invalid. 沒人照顧這個病人。

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

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線電報員遣送回國。