英美人天天都在说的4000句:努力干活,毫不停歇 Get sb.'s Nose to the Grindstone

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J：Why don't you have your friends join us?
S：Why, sure. Hey, why don't you kids drive down with us, huh?
G：Oh, I'm afraid I couldn't get away, Sam.
S：Still got the nose to the old grindstone, eh?
Jane, I offered to let George in on the ground floor in plastics and he turned me down cold.
G：Oh, now don't rub it in.
S：Ah, ah, I'm not rubbing it in.