求翻译：在金属蒙皮机翼下,桁条的主要功用是:支持蒙皮,防止它在承受局部空气动力时产生过大的局部变形,并与蒙皮一起把局部空气动力传给翼肋;提高蒙皮的抗剪和抗压稳定性,使它能更好地承受机翼的扭转和弯矩;与蒙皮一起承受由弯矩引起的轴向力.是什么意思？

In metal Mongolian skin wing Xia, truss section of main function is: support Mongolian skin, prevent it in bear local air power Shi produced had large of local deformation, and and Mongolian skin together to local air power pass wing rib; improve Mongolian skin of anti-shear and anti-pressure stabil

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Under the metal covering wing, the purlin main function is: The support outer covering, prevented it when withstanding partial aerodynamic force has the oversized local distortion, and passes to together with the outer covering the partial aerodynamic force the wing rib; Enhances the outer covering

In metal Mongolian skin wing Xia, truss section of main function is: support Mongolian skin, prevent it in bear local air power Shi produced had large of local deformation, and and Mongolian skin together to local air power pass wing rib; improve Mongolian skin of anti-shear and anti-pressure stabil