来自profession,职业，专业。

1. He seemed fond of her in a strictly professional way.

他似乎只是出于职业缘故而喜欢她。

2. I'm a novice at these things, Lieutenant. You're the professional.

中尉，做这些事情我是新手，你是行家。

3. Support for monogamy and marriage was strongest among the professional classes.

专业人士阶层最支持一夫一妻制。

4. I've always kept my private and professional life separate.

我总是将私生活和工作分开。

5. He is a model professional and an example to the younger lads.

他是个模范的专业人士，是年轻人的榜样。