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Sign of the net emission of air is vent out all the water.
空气排净的标志是，排气孔中出来的全部都是水。
youdao
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Reducing emission and save energy and water from myself.
减少排放和节约能源和水资源，从我自己做起。
youdao
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Reducing emission and save energy and water from myself.
减少排放和节约能源和水资源，从我自己做起。
youdao