该指示可以是可听的，比如音调或语音，可以是可视的，比如闪光，或者可以是可用触觉感知的，比如振动。
The indication can be audible such as a tone or a voice, visual such as a flashing light, or tactile such as vibration.
该指示可以是可听的，比如音调或语音，可以是可视的，比如闪光，或者可以是可用触觉感知的，比如振动。
The indication can be audible such as a tone or a voice, visual such as a flashing light, or tactile such as vibration.
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