Electric power system frequency is an important indicator of power quality and is one of the most important parameters of power system operation.

电力系统频率是电能质量的重要指标之一，也是电力系统运行最重要的参数之一。

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Electric ranges are inherently less friendly and harder to use because they lack that sound-they require indicator lights to tell us of their status.

因为没有声音，电炉天生就不如煤气灶友好，更难使用，它们需要指示灯告诉我们其状态。

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To avoid false readings that can lead to electric shock and injury, replace the battery as soon as the low battery indicator appears.

为避免因错误读数而引起的电击或人身伤害，出现电池电量不足的显示时，应更换电池。

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Several well-known studies from the 1960s involving lab coats, prison guard uniforms and electric shocks show we are more likely to rely on uniforms as an indicator of expertise and authority, than not.

FORBES: Are You Dressing The Part Of Your Job?