有很好的气密性可在负压下反应方便地组装成蒸馏回流装置。
With very good air-tightness, can conduct reaction under negative pressure and easily assemble distillation, reflow device.
反应过程中生成的气体通过冷凝回流装置不断地从反应体系中分离溢出。
During the reaction, the evolved gases were constantly separated through condenser from the system and collected in the 400ml measuring cylinder.
建筑法规可能还需要防虹吸或回流装置，使地表水不会被拖进水管道线路和住宅回来。
Building codes may also require anti-siphon or backflow devices, so surface water won't be pulled back into water lines and residential plumbing.
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