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。
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。
The thrust force is mainly due to the drag of the wings in the upstroke.
平衡身体阻力的推力主要由翅膀上拍中产生的阻力提供。
The thrust force is mainly due to the drag of the wings in the upstroke.
平衡身体阻力的推力主要由翅膀上拍中产生的阻力提供。
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