Other options to restore the frescoes would have required using chemicals to remove the unwanted layer or using physical means to scrape it off.

其他修复壁画的方法可能需要使用化学物质来去除不需要的层，或者使用物理方法将其刮掉。

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Controlling routing at the physical network layer embeds policy into topology.

在物理网络层控制路由需要将策略嵌入到拓扑中。

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Understanding that it sits between the application layer and the physical layer should help you understand why it is arguably the most important of all the layers.

了解它位于应用程序层和物理层之间，应该可以帮助您理解它为什么很可能是所有层中最重要的一层。

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It features a simple interface and the physical key requirement provides an additional layer of security that avoids using a vendor's redirection service such as those offered by Cloud Engines for PogoPlug or Axentra for Netgear's Stora.

ENGADGET: Switched On: MyDitto NAS has some key issues

To change your view layer in Apple Maps you have to tap the lower right corner (helpfully curled over as if it were physical paper) to reveal quite small traffic, satellite and hybrid views among four other options.

FORBES: Hands On With New Google Maps For iOS: Easier On The Eyes And Faster For The Fingers