... indicator drop 指示牌 indicator for water level 水位指示器 indicator paper 试纸 ...
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indicator r for water level 水位指示器
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When the level indicator shows that the water is insufficient in the boiler, the pump will make up water for it automatically.
当液体指示器显示锅炉内水不充足时,泵将自动为其补充水。
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