以下为句子列表：
英文: AR Air Regulators in multiple burner systems, hold constant air-fuel ratio and the mixture pressure with reducing burner port area of up to 90 %.
中文: AR空气调节阀用于多炉头系统，保持恒定的空气燃料比和混合气压力。
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英文: The regulator holds a constant air-fuel ratio from cold start-up through hot air operation.
中文: 调节阀能够从冷启动到热空气运行一直保持恒定的空气-燃料比例。
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