... 站内道口联系电路 liaison circuit with highway crossings within the 照查锁闭 check locking 遮断信号 obstruction signal ...
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Double-Check Locking 双检锁 ; 双重锁定
Optimistic locking using check-and-set 乐观锁
Visual check of locking devices 目测检查锁紧装置
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During that era, most patients paid in cash or with a personal check, and I was assigned the responsibility of putting the money in the safe and locking both the safe and the building after the last patient left the clinic.
FORBES: What I Learned from Leaving the Safe Unlocked
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