lower harness thread plate 下夹板 ; 下底板
lower harness thread lip 出口下缘
lower harness thread nut 下螺母
lower harness thread pool 船闸后池
lower harness thread hook 引线钩
lower harness thread leaf 下分层
lower harness thread pass 下孔型
lower harness thread mast 下桅
lower harness thread head 下闸首
lower harness thread node 下节点
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