以下为句子列表：
英文: In addition, the author describes how to set up the basic process parameters of heat treatment with protective atmosphere, and gives us case analysis concerning protective atmosphere heat treatment of automobile tube, precision structural tube and power s
中文: 介绍了保护气氛热处理主要工艺参数的确定及汽车用管、精密结构用管、电站锅炉用管的保护气氛热处理实例分析。
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英文: The absence of a protective atmosphere means the moon has been subjected to intense bombardment in its 4.5 billion-year existence.
中文: 由于缺乏大气的保护，月球在它存在的45亿年间遭受了强烈的撞击。
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