If dict deletes list dangling pointer.

删除文件,会产生悬挂指针问题.

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After deleting pointer, the pointer becomes what is referred to as a dangling pointer.

删除指针后, 该指针变成悬垂指针.

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A dangling pointer can be the source of program errors that are difficult to detect.

悬垂指针往往导致程序错误,而且很难检测出来.

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