keep an ear tothe ground 时刻提醒自己

来源：必克英语 2010-02-21

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In English, when we need to remind ourselves for something, we can say: "I have to keep an ear to the ground."

For Example:

Shirley: Baby, what about having some beef for dinner?

May: Oh, no. Mon, I am on a diet now. I have to keep an ear to the ground

The man may be a spy. Have an ear tothe ground .

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