mean free pathmi:nfri:pɑ:θ短语¹⁴⁴⁹⁷²⁺² 基本例句 平均自由行程 The dominant factor for Auger signal during the interface analysis is the altered layer with a thickness of30-50A rather than the electron mean free path X. 影响层的厚度为30—50埃，它是进行深度剖面分析时，决定元素俄歇信号强度的第一位重要因素； cnki