"Advanced knowledge" is the basic concepts of higher education, complexity thinking has such characteristics as non-linearization, entirety, relationship and process, etc.
“高深知识”是大学教育的基础理念，复杂性思维以非线形思维、整体思维、关系思维、过程思维为特征。
Use back seal design, can replace top seal parts under pressure. Entirety of non-rising bonnet design, have compact structure.
采用倒关双密封设计，可带压更换上密封组件，整体阀盖暗杆设计，结构紧凑。
The entirety system error sourced from the length error and time error and light-beams non-parallelism.
系统整体误差的主要来源为距离测量误差、时间测量误差以及光束不平行度产生的误差。
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