地刀全称接地刀闸，是安装于高压开关柜内代替接地线的一种安全连锁机构。根据五防的要求，地刀只有在设备检修、断路器和隔离开关断开时才能闭合，相当于一根接地线。正常运行时地刀必须是断开，且通常设备中都设有机械联锁装置。断路器闭合时，地刀合不上；同样地刀合闸时，高压断路器也合不上。
如错误操作有：运行状态拉合小车、热备用状态合地刀（挂地线）、检修状态合小车等。
Normal positions: running condition, hot standby mode, cold standby mode, maintenance condition, and trolley operation conditions, etc.
一个重大的发明是可调节的支柱，通过改变刀板与横梁的距离来精确地设置犁的深度。
A major invention was the adjustable strut that could precisely set the depth of the plow by altering the distance of the blade and the beam.
随着她右手里的手术刀微妙地移动，她伸出左手指给我看经过数百万年的进化产生出来的奇迹。
With a scalpel held delicately in her right hand, she reaches over with her left to show what millions of years of evolution has produced.
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