In aerodynamic terms, lift is a function of weight, thrust and drag (air resistance).

在空气动力学上，升力是重量，推力和阻力(空气阻力)的相关的函数。

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If thrust and drag do not equal each other, the airplane can not fly at a constant speed.

如果推力和阻力彼此不相等，飞机就不同能等速飞行。

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The configuration also provides acoustic shielding and, at low speed, increases aircraft lift without a thrust or drag penalty.

该构造还提供声屏蔽，并且在低速下，增加飞机升力的同时没有推力或阻力损失。

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With no thrust and plenty of drag, we rapidly slowed to 100 knots, then 80 knots.

FORBES: Magazine Article

By changing the angle of its wings and its body, the moth was able to create a delicate balance between the thrust pushing it forwards, the drag - or air resistance - pushing against it, and the lift keeping it in the air.

BBC: Footage reveals how insects use their bodies to hover