The reason it's so huge is simple: OOXML is essentially a completereplication of every chunk of data that a Microsoft Office application might possibly save in a file.
该标准之所以如此庞大，是因为 OOXML 几乎完全复制了 Microsoft Office 应用程序在文件中可能保存的所有数据块。
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With asynchronous replication, order is preserved, but the write is allowed to complete without waiting for an acknowledgement from the target node that the write has been received there.
With synchronous replication, the write on the production node does not complete until it has been received on the target node, so you are guaranteed identical copies on each side.