Practice sessions should be conducted during low-demand hours of the elevator system and in the presence of a supervisor within the facility, or trained elevator technician.

在电梯使用少时应进行演练，届时，需要有设备管理主管或者受过培训电梯技术员在场。

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Technician was adjusting air valves on pallet elevator behind the safety guard.

该技工实际上是在调整安全装置后面的托盘货物升降机的气阀。

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There, a technician wil explain how an elevator works and will explain the many safety features elevators have.

在这里，一个技术员就给你们解释电梯的工作运行情况和许多的安全设置。

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