突然，一块亮斑出现在了主显示屏上。

Then suddenly, a tiny spot of light began to show on the main monitor.

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加热器工作时调节旋钮处的led屏会亮。

Heater work adjustment knob at the LED screen will be bright.

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加热器工作时调节旋钮处的led屏会亮。

Heater work adjustment knob at the LED screen will be bright.

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