All My Sons tells of a manufacturer who produces faulty parts for airplanes used in World War Two.

《都是我的儿子》讲述的是一个制造二战飞机部件的制造商。

An investigation of the accident found a faulty part in the right rocket booster caused the Challenger explosion.

事故调查发现，挑战者号航天飞机爆炸的原因是右侧火箭助推器的一个零件有问题。

That means upgrading aging equipment or replacing faulty parts.

理发师：这意味着升级老化设备或更换有故障的零件。

A " faulty (faulty) part" would be a part of a machine that doesn't work properly.

“故障（故障）部件”是机器无法正常工作的部件。

Of course, you don't want faulty parts in an airplane because the airplane could stop working and the people in the airplane would die.

当然，您不希望飞机出现故障部件， 因为飞机可能会停止工作并且飞机上的人员会死亡。

Meanwhile, the latest whistleblower to make a complaint revealed that Boeing lost track of 400 faulty parts, and that some of them may have been installed on planes. Boeing's share price is down by 30% this year.

与此同时，最新一位提出投诉的检举者透露，波音公司丢失了400个有缺陷的部件的踪迹，其中一些部件可能已经安装在了飞机上。波音公司的股价今年下跌了30%。