次框架的地震反应比主框架强烈，在结构抗震设计中不能忽略次框架的抗震问题。
Therefore, the earthquake resistance of the sub-frame cannot be ignored in the design of construction.
介绍了主反射镜的一种轻量化结构设计；
A kind of structure design of lightweight of primary mirror is introduced in this paper.
在大功率电源产品的结构设计中， 主电路的结构设计至关重要。
The mechanism design of power electrocircuit is very important in a high power supply.
在大功率电源产品的结构设计中， 主电路的结构设计至关重要。
The mechanism design of power electrocircuit is very important in a high power supply.
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