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to let somebody know
01
to give a person information about something
例
Please stretch out the measuring tape and let me know how long the table is.
Let me know if I'm bothering you, and I'll leave you alone.
He let me know that he couldn't make it to the meeting.
We should place a call to the office to let them know we'll be late.
Please let me know if you notice any unusual behavior in the software.
