列管式固定床反应器催化剂支托的结构形式，经历了由繁到简、由难到易的演变。
The structure forms of catalyst support for tubular fixed bed reactor underwent the evolution from complex to simple and from difficult to easy.
帘头采用由繁到简的重叠设计，有画龙点睛的效果，且手工精细，造型高贵典雅，美观实用。
Shade head by multiplying the overlapping design to Jane, have the effect that make the finishing point, and fine handwork, modelling elegant, beautiful and practical.
玉蝉是一种常见的古代玉器，从先秦到汉代玉蝉的形制由简入繁且趋向写实。
Jade cicada is a common type of the jade object, and the shade of the jade cicada changed from simplicity to complexity and tending to real.
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