You may ask the librarian to help you.

你可以请图书馆管理员来帮助你。

youdao

I can't find it. Let's ask the librarian.

我找不到。我们来问问图书馆员吧。

youdao

You may ask the librarian to help you. He will be glad to help.

你可以找图书馆管理员，他会很乐意帮助你的。

youdao

I'm not sure if the Yale Library has this or not, but if they don't you could ask the librarian to get it.

我不太确定耶鲁的图书馆是否有这本书,但是如果他们没有,你们可以要求图书管理员购置

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And if all those weren't enough, many ask-a-librarian services exist, often for free, including one run by the Library of Congress.

FORBES