当某个事物发生更改时，我们通常将结果视为该事物更改后的新版本。

When something changes, we often think of the result as a new version of the thing that changed.

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与新版本相关的对象和属性在向后迁移后将丢失，因此在运行新版本较长一段时间后最好不要进行向后迁移。

Objects or attributes relating only to the new version will be lost after a backward migration, and therefore you should not backward migrate after running the new version for an extended period.

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如果您不修改清单，则浏览器永远不会费心去加载修改后的资源的新版本。

If you do not change the manifest, the browser will never bother to load the new version of the resource that you modified.

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