Let me know how I can help.

我能帮什么忙，只管说。

《牛津词典》

Let me know if he bothers you again.

他要是再搅扰你，就告诉我。

《牛津词典》

Let me know if you have any problems.

你若有困难就告诉我。

《牛津词典》

They receive permission and open fire on the group. "Let Me know when you've got them."

VOA: standard.2010.04.06

I hope you enjoy using Star Festival and do let me know the questions that you are trying to answer.

事情，我希望你使用“七夕“愉快并让我了解,你想找出答案的那些问题。

麻省理工公开课 - 媒体、教育、市场课程节选

If there are, let me know, I would love to meet that super model.

如果真有的话，告诉我，我还真想见见这样一位超级模特。

退休很神奇 - SpeakingMax英语口语达人

Let me know how you are feeling and doing as you find more positive four letter words.

FORBES: Briefing Book: A. Michael Lipper

Let me know if anything more is needed, or if there is too much detail here.

NEWYORKER: A Beneficiary

Think over the matter, and let me know your second thoughts as soon as convenient.

FORBES: Forgotten Bookmarks: Congregational Strife, Circa 1834