在前进的道路上我们添加沉重钢床上的支持，加强框来处理更高的有效载荷和拖曳设备性能的分析，F - 450 F - 550。
Along the way we add heavy gauge steel bed supports that strengthen the box to handle the higher payload and towing capacities of the F-450 and F-550.
机身为半硬壳结构，轻质合金的环形隔框和纵向长桁支撑并加强了主要机身蒙皮。
The fuselage is a semimonocoque structure, light alloy circular frames and longitudinal stringers support and strengthen the main fuselage skin.
所述的加强结构有两个，分别与车辆的门的框相连接，形成一个回路结构；
Two reinforcement structures are arranged on longitudinal beams, and the two reinforcement structures are respectively connected with each door frame to form a loop structure;
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