飞机工程师正在检查发动机以确保飞行安全。

The aircraft's ___engineer is inspecting the engines to ensure flight safety.

我的哥哥是一名软件工程师，他开发手机应用程序。

My brother is a software ___engineer who develops mobile applications.

我们需要一位工程师来帮助我们建造这座桥。

We need an ___engineer to help us build this bridge.