保存历史版本（我们将在第17章中详细讨论）简单地复制整个文档，就像照相机快速将一幅图像在时间上凝固一样。
Versioning (as we'll discuss more in Chapter 17) simply makes a copy of the entire document the way a camera snapshot freezes an image in time.
保存历史版本（我们将在第17章中详细讨论）简单地复制整个文档，就像照相机快速将一幅图像在时间上凝固一样。
Versioning (as we'll discuss more in Chapter 17) simply makes a copy of the entire document the way a camera snapshot freezes an image in time.
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