evaporator vapor ; evaporator vapour
浓时产生二次蒸汽，通过蒸发器上升管送入提取罐作提取的热源和溶液，维持提取罐内沸腾。
The second vapor produced during concentration can enter the extraction tank through the upward pipe at the evaporator to serve as the heat source for extraction to maintain the boil inside the tank.
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