The structural principle and production and application of three dimensional self crimp fibers were analysed and summarised.

综述了三维卷曲纤维的自卷曲结构原理和主要生产工艺，以及三维卷曲纤维的性能与应用。

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In order to improve the system reliability, some measures such as "two out of three" principle, air sampling and self-verification were adopted.

采用“三取二”原则、空气取样、系统自检等措施提高了系统可靠性。

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This principle requires the Anchor to understand his status and function in the program from three aspects: "self-orientation", "nonego performance" and "roles conversion".

“角色原则”要求主持人必须明确自己在节目中的地位和作用，从“自我定位”、“非我表演”及“角色转换”三个方面明确“你是谁”。

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