这种包外面有一个H形的金属架，外面可以挂摄影箱，炉子之类的器械。
The outside of the bag with the metal frame in a H shape, the outside can hang the photo box, furnace equipment like the.
基于以上原因，本文采用了两种方法对箱形梁桥架进行优化设计。
According to the above reasons, two kinds of methods are adopted to optimize the box-main-girder bridge.
进行了箱形臂架局部稳定性的有限元分析。
Finite element analysis of local stability of the box-sectioned boom is performed.
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