离线时，它只能访问缓存清单中的离线资源。

When offline, it can only access offline resources in the cache manifest.

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这意味着，在默认情况下将应用程序看作是离线的，不显示在线网络资源。

This means that by default, the application is assumed to be offline, and no online resources are shown.

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从最简单的形式来说，弹性的解决方案可允许添加或删除资源，而不会让系统离线。

In its simplest form, a solution might be elastic by simply enabling more resources to be added or removed without bringing the system offline.

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