The switch apparatus is a key element for total electric power system in reliability.
开关电器是整个电力系统工作可靠性的关键元件。
Turn on the sub-power supply switch and key of screen displaying.
打开触摸屏下面的电源键，打开显示屏幕。
The large aperture KDP electro-optical switch is a key unit for the new high-power laser multi-pass amplification system.
大口径KDP电光开关是新一代高功率激光器多程放大系统的关键部件。
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