一种亚稳态铁酸盐和碳化铁集合体，由奥氏体在低于珠光体温度但高于马氏体初温时变性而形成。
A metastable aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures below the pearlite but above the marten site start temperature.
课程是一种集认识、实践和价值实现为一体的过程集合体，它是一个动态的系统，故也可称之为课程系统。
The curriculum is a process of understanding, practice and value realization, and it is a dynamic system, so it also be called curriculum system.
一种数据媒体和记录在媒体上的信息的集合体，通常可以永久保存并可供人或机器所阅读。
A medium and the information recorded on it that generally has permanence and that can be read by man or machine.
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