The said connecting part connects with front side member and rear side member separately to make the composed box border sheet capable of folding in side direction.
该连接件又分别连接前侧杆和后侧杆，使得组成箱体边片能侧向折叠；
The said connecting part connects with front side member and rear side member separately to make the composed box border sheet capable of folding in side direction.
该连接件又分别连接前侧杆和后侧杆，使得组成箱体边片能侧向折叠；
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