The convenience layer API implements a suite of APIs for each document feature, and one feature might cover multiple XML elements.

便利层 API 为每个文档特性实现一套 API，一个特性可能涉及多个 XML 元素。

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The specification does not cover network layer vulnerability information such as network topology, TCP-related attacks, or other network layer issues.

规范中没有涉及网络层漏洞的信息，比如网络拓扑、TCP 相关的攻击，或网络层的其它问题。

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NPP carries five science instruments designed to help researchers track everything from the ozone layer to ice cover, and to help them develop both long - and short-term forecasts.

NPP携带了5台科学仪器，用来帮助研究者跟踪从臭氧层到冰盖的各种信息，并协助他们开展长期和短期预测。

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The result is that any coating, such as an antibacterial layer, would be "self-repairing" after small amounts of damage, as the molecular chains just below the damaged layer re-cover the surface.

BBC: Coating heals itself after damage