Don's lifejacket had failed to inflate.是什么意思？

Don's lifejacket had failed to inflate.

唐的救生衣未能充气膨胀。

lifejacket

救生衣；

例句
Don's lifejacket had failed to inflate.
唐的救生衣未能充气膨胀。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

failed

adj. 失败了的，不成功的；v. 在…中失败( fail的过去式和过去分词 )，衰退，衰弱，破产；

例句
They recently failed to negotiate a mutually acceptable new contract.
他们最近未能谈成一个双方都满意的新合同。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

inflate

vt.& vi. 使充气（于轮胎、气球等），（使）膨胀，（使）通货膨胀，物价上涨；

例句
The promotion of a big release can inflate a film's final cost...
大规模发行所需的广告宣传会增加一部电影的最终成本。