This provides an additional layer of security.

这提供了额外的一层安全性。

However, an additional layer of semantics comes into play with XML.

然而使用XML时会产生一个语义的附加层。

Clouds were done with a basic airbrush on an additional layer.

在另一个图层上用基本的喷枪绘制韵。

As previously mentioned, identity mapping adds an additional layer of security to the scenario.

如前所述，身份映射给该场景添加了一个额外的安全层。

Views and packages provide an additional layer of security by shielding you from the internal details.

视图和包使您与内部细节分隔开，从而提供了一个附加的安全层。