The young man is my top banana.

这个年轻人是我的老板。

Who is your top banana?

谁是你们的老板？

He is a top banana in this corporation.

他是公司的老板。

You'll get the chance to have an interview by the top banana.

你将有机会由公司老板亲自面试。

Example: our principal, Mr. Williams, is the top banana at our school.

例：我们的校长威廉姆斯先生是我们学校的头头。