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かすがい， 鎹
1. large staple driven into two pieces of wood to hold them together, clamp, cramp (metal)
2. tie (metaphorical, e.g. something that binds two people together)
3. latch, lock
大钉子钉入两块木头以固定它们，夹具，夹板(金属)；纽带(比喻意义，例如将两个人联系在一起的事物)；门闩，锁