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Dad: My dear, let’s go out for a walk. Son: Great. ( On their way, a dog is barking nearby.) Son: Oh, help! A dog is over there Dad: Don’t be afraid, Tom. Don’t you know the proverb”A barkingdog does not bite?” Son: Yes. I know the proverb ,you know the proverb, but the dog know the proverb? 问题在下面 What did the son see?