基本解释安全手柄词组短语短语dead -man's handle 安全手柄dead-man's handle更多词组英英字典柯林斯英英字典 a safety switch on a piece of machinery, such as a train, that allows operation only while depressed by the operator dead-man's handle剑桥字典dead-man's handle柯林斯字典专业释义管理学自回位手柄