Boiler is an equipment of produce steam, to keep the water level of the boiler drum within a certain range is very important.
锅炉是生产蒸汽的设备，保持锅炉汽包内的水位在一定范围内是非常重要的。
Boiler is an equipment of produce steam, to keep the water level of the boiler drum within a certain range is very important.
锅炉是生产蒸汽的设备，保持锅炉汽包内的水位在一定范围内是非常重要的。
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