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 forces on a spinning ball that is flying through the air are generally divided into two types: a lift force and a drag force.

空气中运行的旋转球的受力通常分为两种：升力和阻力。

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The Delta IV Heavy has since completed several more successful lift-offs, while its next launch is currently planned from Vandenberg Air Force Base, California, USA, next month.

Delta 4型重型运载火箭之后又成功完成了更多次的运载任务，目前它的下一次发射定于下个月在美国加州Vandenberg空军基地进行。

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At certain moments the air streamed against the ship as if sucked through a tunnel with a concentrated solid force of impact that seemed to lift her clean out of the water and keep her up for an instant with only a quiver running through her from end to end.

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