The tail is fixed on the model plane with nails.

机尾用钉子牢牢固定在模型飞机上。

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The fixed costs of modern passenger aircraft are very high, but the marginal costs--the costs of carrying one more passenger if the plane is not full--are very low.

现代客机的固定成本巨大，但是其边际成本-在未满的前提下每增加一名乘客所增加的成本-非常低。

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Fixed: Supply plane cannot be heard.

固定：供应飞机不能被听到。

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Visitors can see the falls from many vantage points: above from a helicopter or microlight fixed wing plane, at eye level walking across the Knife Edge Bridge that spans the width of the falls on the Zambian side, or from below on a hike.

BBC: Livingstone��s Zambia

They are the biggest purchaser of the revolutionary Osprey tiltrotor, which pivots its engines so it can take off like a helicopter, but fly as far and fast as a fixed-wing plane.

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Part of that need will be met in the future by a new generation of rotorcraft, including the revolutionary MV-22 tiltrotor that combines the vertical agility of a helicopter with the speed and range of a fixed-wing plane.

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