What you see is not siding but enforcement ribs as the walls of the construction are made of metal.
你看到的不是壁板，而是加强用的骨架。因为建造这些墙的材料是金属。
INTEGRAL TANK, a metal container formed by the wing structure (spars, ribs, skin) for storage of fuel on the airplane.
整体油箱，由机翼结构件梁、肋、蒙皮组成，用来在飞机上储存燃油的金属容器。
INTEGRAL TANK, a metal container formed by the wing structure (spars, ribs, skin) for storage of fuel on the airplane.
整体油箱，由机翼结构件梁、肋、蒙皮组成，用来在飞机上储存燃油的金属容器。
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