After using that burner, the boiler safety, economic and long period operation were secured further.

改用该燃烧器后，进一步保证了锅炉安全、经济和长周期运行。

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After the half hour of cooking, turn off the burner.

半小时后，做饭，关闭燃烧器。

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After the half hour of cooking, turn off the burner.

半小时后，做饭，关闭燃烧器。

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