不幸的是对移动网络应用支持者来说，这些优势也伴随着同等的劣势。

Unfortunately for mobile Web app fans, these benefits also come with equal and opposite disadvantages.

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在这个全新的说明中，其一个关键特点是离线支持网络应用。

In the new specification, a key feature is offline support for web apps.

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需要网络支持来实现下载，但不能应用于播放。

Networking support is required for downloading but not for playback.

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