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翼形螺母的俯视图。选择框代表螺纹直径。
Top view of wing nut. Selection box represents thread diameter.
他梦想着设计一种主动机翼，而不是仅仅重新设计机翼形状。
Instead of just redesigning the shapes of wings, he dreams of making them more active.
直接的方法是基于设计逐案分析的方法是机翼形状指定第一。
Direct methods are based on the design-by-analysis approach in which the airfoil shape is specified first.
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