We believe that the only viable strategy for authenticating users is to apply the defense in depth principle, mixing a number of authentication techniques.

我们相信用于认证用户的唯一可行的策略是以深度原则应用防御，混合多种认证技术。

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There are various and complicated reasons for the code-mixing, such as social culture, social psychology and the principle of economy, etc.

语码混合的原因很多，但是，最主要的有社会文化，社会心理和经济原则等因素。

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With describing the cascade refrigeration technique, the mixing refrigeration technique, and the expanding refrigeration technique, the working principle of the above 3 LNG plants is introduced.

在简述阶式制冷工艺、混合制冷工艺和膨胀制冷工艺的基础上，介绍了上述3套国内液化天然气工厂的工艺原理。

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