介绍:
Bear has a doorbell.If you visit him, you must ring his doorbell.
One day,Mr.Panda visits him. He knocks at his door.Atter a while, bear shouts in the room,"Please ring the doorbell!"But Mr.Panda doesn't hear it.He knocks again.This time,bear opens the door and says,"Don't knock at the door .I can't hear.Ring the doorbell ,please."
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