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.
youdao
可食用蟹，换壳后时间长因而有一个硬壳。
The horseshoe craB isn't really a craB at all.
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