Drag is the force of air resistance pushing against a ball's motion and slowing it down, while lift is a force causing a ball to swerve off a straight path.

拉力是一种物体在空气中所受到的阻力，它能产生与球运行方向相反的作用力，减缓球的运行速度，而升力则是一种能使物体偏离直线运行轨迹的力。

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The gas was slowed by a drag force similar to air resistance.

由于类似空气阻力的牵引作用，这些气体的（运行）速度减缓。

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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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This low, air resistance creates drag, so the station is constantly slowing down and losing altitude at the rate of about two miles of altitude every month.

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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