Electric switch [电] 电开关 ; 电器开关 ; 电动开关 ; 电门
electric switch board 电键板 ; 电掣板
electric switch machine [铁路] 电动转辙机 ; 电气转辙机
electric switch heater 道岔电热器
electric switch circuit controller 转辙电路控制器
electric switch group 电开关组件
Opto-electric Switch 光电开关
By increasing or lessening the hours of darkness in each day, the scientists have been able to turn plant growth off and on like an electric switch.
用增加和减少每天黑暗小时数的方法，科学家已经能够控制植物生长，如同控制一个电器开关。
At the bottom of the stairs my hand met an electric switch. I turned it, and a great electrolier of twelve red globes flooded the cellar with a red light.
到了最下边一级台阶，我的手碰到一个电源开关，我打开它，一座安了十个红灯泡的大型吊灯架让地下室里一片红色。
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