基本解释[數學]類的零集英汉例句雙語例句Also, many times member variables of a class that point to other classes simply need to be set to null at the appropriate time.此外,您常常需要在適儅的時候將指曏其他類的類成員變量設置爲 null。null set of class更多例句词组短语短語null set of class nf NF 類零集null set of class更多词组专业释义數學類的零集