But there's no need to tell someone at a party that you're a qualified engineer, alright?

但是没有必要在聚会上告诉别人你是具有资质的工程师，对吧？

Major repainting work now needs to be signed off by a qualified engineer.

【sign，signer】现在重要的重新油漆工作需要有资质的工程师签字认可。

First and foremost, china has become particularly active in manufacturing, which has led to an increased demand for qualified engineers.

首先，中国在制造业方面变得异常活跃，这使得对高素质工程师的需求增长。