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。
Listen for any audible air leaks, unusual noises, fuel pump buzz (a noisy pump may not be an indication of poor operating condition), engine rattles or knocks. E.
听是否有空气泄漏声，油泵嗡嗡声(油泵有声音并不意味着工作不良)，发动机卡嗒卡嗒声或爆震声。
Listen for any audible air leaks, unusual noises, fuel pump buzz (a noisy pump may not be an indication of poor operating condition), engine rattles or knocks. E.
听是否有空气泄漏声，油泵嗡嗡声(油泵有声音并不意味着工作不良)，发动机卡嗒卡嗒声或爆震声。
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