| 单词 | second axiom of countability |
| 释义 | second axiom of countability‘数’第二可数公理second axiom of countability第二可数[性]公设；第二可数[性]公理双向☞axiom of second countability -- second axiom of countability双向☞second axiom of countability -- second countability axiomsecond axiom of countability第二可數[性]公設；第二可數[性]公理數 |
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