xml加密允许应用程序使用对预先约定的对称密钥的引用来加密部分或全部XML文档。
XML encryption allows applications to encrypt part or all of an XML document using references to pre-agreed symmetric keys.
文件包括了美国在与超级大国战斗中承受部分危险的界线，以便在不对称的、非常规的冲突中获胜。
It included a line about the US accepting some risk in fights with superpowers in order to win asymmetric, unconventional conflicts.
除此之外，不对称元素的使用更是创造了视觉层次，用以区分其它部分。
However, we can also see that there are plenty of asymmetrical elements, employing them to create visual hierarchy and distinction in certain areas of the design.
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