In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible.

在一棵完全二叉树的每一层，除最后一层外，其余各层都是填满的，并且最后一层的节点尽可能的靠左排列。

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Only pages that have changed since the last Level-0-Backup will be backed up.

只备份自上一次0级备份后发生更改的页面。

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Only pages that have changed since the last Level-0-Backup will be backed up.

只备份自上一次0级备份后发生更改的页面。

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