Tom is a good mechanical engineer.

汤姆是个优秀的机械工程师。

I'm a mechanical engineer.

我是个机械工程师。

Job Prospects: Mechanical engineer, chemical engineer.

就业前景：机械工程师，化学工程师。

Belt drive is widely used in mechanical engineer.

带传动是机械工程中应用十分广泛的一种传动形式。

He is also mechanical engineer, working in England.

他也是机械工程师，在英国工作。