By studying the relations of the extensibility of matter-element with the extension field of a matter-element extension set, two ways to determine the extension field are obtained.
通过研究物元的可拓性与物元可拓集合的可拓域之间的关系，得到了两种确定物元可拓域的途径。
By studying the relations of the extensibility of matter-element with the extension field of a matter-element extension set, two ways to determine the extension field are obtained.
通过研究物元的可拓性与物元可拓集合的可拓域之间的关系，得到了两种确定物元可拓域的途径。
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