常見(jiàn)例句雙語(yǔ)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(shí)候?qū)⒅笗谄渌惖念惓蓡T變量設(shè)置爲(wèi) null。 返回 null set of class