Because a namespace prefix in a parent node can be overridden by a child node, for example default namespace, a namespace is not copied again if it has been copied to the target.
由于父节点的名称空间前缀可以被一个子节点覆盖，比如默认名称空间，因此如果名称空间已被复制到目标，那么就不会再次复制该名称空间。
Static methods cannot be overridden but can be hidden if they are not final (Read about Overriding vs Hiding here).
静态方法不能被覆盖，但如果它不是决定性的则可以被隐藏。
If the work item has been transferred before, the transfer history is applied again, thus a previous transfer is not overridden by this refresh.
如果以前传输了工作项，将再次应用传输历史记录，因此该刷新不会覆盖以前的传输。
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