小螃蟹和小青蟹是一对好朋友、好邻居，小螃蟹每天都会在墙壁上"咚、咚"地敲两下，来和小青蟹打招呼。可是有一天，小青蟹要离开去寻找更好的地方了。小螃蟹很孤独，只能每天对着墙壁"咚、咚"地敲着，却再也没有人回应他。
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