第三人称单数：knocks together 现在分词：knocking together 过去式：knocked together
1.使碰撞;颤抖着相碰
2.拼凑;赶造,赶建
1.to make two rooms or buildings into one room or building by removing a wall that separates them
2.to produce something quickly and easily
3.used for threatening to punish two people or groups who are fighting
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