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Its advantage is that the relative coordinate value may be Siven conveniently for the arbitrary oblique section of wing surface.

本方法的优点是，可以方便地给出翼面类任意斜截面外形的相对坐标值。

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If this load centroid is behind the elastic axis of the wing structure, then a nose-down twist of the main wing surface results.

如果该载荷重心在机翼结构弹性轴之后，则引起主机翼表面前端向下的扭转。

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It seems an important fire had broken out at the level of the intrados (under surface) of the left wing.

CNN: graphic

But Dr Dial wanted to be sure, so he compared the accomplishments of normal partridges with birds that had their wing feathers clipped to half their normal surface area, and to even less fortunate fowl whose main flight feathers were entirely plucked.

ECONOMIST: Birds that don't fly may be using their wings to run uphill

Instead of moving a physical surface, fluidic controls divert the airflow over a wing by blowing compressed air out of narrow slots.

ECONOMIST: How to fly without ailerons