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1·The sack is too heavy to lift—you'll have to drag it.

这麻袋太重了，提不起来。你得拖着走。《牛津词典》

2·The aerofoil of a wing creates more lift than drag, but exactly how much depends on its design and the speed of the air passing over it.

飞机上的机翼制造升力超过阻力，但具体取决于机翼的设计和当时经过的空气流动速率。

3·But it was a birdlike tail that really amped up the aerodynamics, dampening the drag from the body and wings, as well as boosting the lift that lags under vehicle weight and cargo load.

的确鸟儿尾巴一样的飞机尾部改善了空气动力学性能，缓解了机体和机翼的阻力，同时还大大的增加了向上的力，缓释了由于飞机本身和货物重量而产生的向下的力。

4·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。

5·At altitude, the air pressure is lower, and so are aerodynamic effects such as drag and lift, ultimately causing balls to travel faster and straighter than they would at lower altitude.

由于地处高海拔地区，气压较低，因而作用在球上的阻力及升力所产生的空气动力效应也会发生相应反应，最终导致球在空中飞行速度比在低海拔地区快，飞行的路线也更直。

6·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。

7·The modern airplane design works well, but from a fuel efficiency standpoint, could planes be designed more aerodynamically — to lower drag and increase lift?

现代的飞机设计做得很好，但立足于燃料效率来看，飞机是否能设计得更符合空气动力学——降低阻力还是增加动力？

8·When the shape of a wing creates more lift from the air passing around it than it does drag (air resistance), an aircraft will fly.

当鱼鳍的形状通过流动的空气产生比其(空气)阻力更多的升力时，飞行物便能飞翔。

9·A modern sports glider, with long, slender wings, is the most aerodynamically efficient aircraft, with a lift-to-drag ratio of around 50:1.

现代运动用滑翔机的机翼长而细薄，拥有最佳的空气动力学效率，其升阻比达到50：1。

10·This adds to the lift and allows for longer, skinnier wings and a smaller tail, reducing drag.

这将增加飞机的升力，并且因此能够允许更长、更薄的机翼，以及更小的尾翼，从而还可以减小阻力。