The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress.
如果操作进行中指定集合被修改，那么该操作的行为无法确定。
The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress.
如果操作进行中指定集合被修改，那么该操作的行为无法确定。
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