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。
In aerodynamic terms, lift is a function of weight, thrust and drag (air resistance).
一个最早的软件物理引擎是ENIAC计算机，用来仿真给定了重量、角度、推力和风速变量的炮弹。
One of the earliest software physics engines was the ENIAC computer, which was used to simulate artillery shells given variables of mass, Angle, propulsion, and wind.
利用光束作为外部能量源可以减轻火箭自身携带的系统重量和质量，为科学研究扩大有效载荷空间，并提供更大的推力。
Using light as an external power source can alleviate the weight and mass of having an onboard system, leaving room for scientific payloads, for example, and it provides more propulsive power.
结果表明：蝴蝶主要用“阻力原理”作拍动飞行，即平衡身体重量的举力和克服身体阻力的推力均主要由翅膀的阻力提供。
The results shows that the vertical and thrust forces of the wings, which balances the weight and the body drag, are mainly contributed by the drag of the wings.
在平常的不压井起下钻作业中，管柱下入井眼是依靠其自身重量，不需要附加的向下载荷或者推力。
In ordinary stripping operations, the pipe falls into the wellbore under its own weight, and no additional downward force or pushing is required.
在单元数足够多时，环簇式塞式喷管可比相同面积比的钟形喷管的尺寸更小，重量更轻，推力效率更高；
When numbers of the inner nozzle are enough, plug nozzle has less size, less weight and higher thrust efficiency than the bell nozzle under same area ratio.
如果想使直升机悬停于某处，这些空气微粒的推力必须相当于直升机重量。
If the helicopter is going to hover in place, the force it pushes on these tiny air balls will have to be equal to the weight of the helicopter.
但是这同样会影响性能。尽管此时直升机可以用更小的功率产生指定的推力，但它的重量增加了。
But this, too, can affect performance, as it is heavier, though it USES less power to achieve a given thrust.
但是这同样会影响性能。尽管此时直升机可以用更小的功率产生指定的推力，但它的重量增加了。
But this, too, can affect performance, as it is heavier, though it USES less power to achieve a given thrust.
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