They think I am a greenhorn.

他们以为我是外行。

youdao

He is a greenhorn in this field.

他在这个领域还是个新手。

youdao

As a greenhorn, he needs our help.

他是生手，需要我们的帮助。

youdao

A century or so later, a greenhorn was a soldier who had not yet had any experience in battle.

VOA: special.2010.05.23

By the eighteenth century, a greenhorn had the meaning it has today - a person who is new in a job.

VOA: special.2010.05.23

In the fifteenth century, a greenhorn was a young cow or ox whose horns had not yet developed.

VOA: special.2010.05.23

That greenhorn VC who took the deal after I'd punted made a killing for her firm--half a billion?

FORBES: Been There, Done That