气体燃烧器可以包括可选的火焰管，该火焰管有可选的排出口，火焰包含于该火焰管中，并与扩散空气隔开。
The gas burner may include an optional flame tube with an optional exhaust port in which a flame is contained and sequestered from diffusing air.
气体燃烧器可以包括可选的火焰管，该火焰管有可选的排出口，火焰包含于该火焰管中，并与扩散空气隔开。
The gas burner may include an optional flame tube with an optional exhaust port in which a flame is contained and sequestered from diffusing air.
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