人们根据建筑物如何处理由重力产生的向下的力来分析它们。
Structures can be analyzed in terms of how they deal with downward forces created by gravity.
所以也有向下的力，图钉上的力mg向上。
Mg so also here we have now mg down, so we have at the pin mg up.
向上的力与向下的力相等，所以气球就保持在这一高度。
The force upward equals the force downward so that the balloon stays at the level.
向上的力与向下的力相等，所以气球就维持正在这一高度。
The force upward equals the force downward so that the balloon stays at the level.
下压力：当车辆向前行驶时，空气动力所施加的向下的力。
Down force : The aerodynamic force that is applied in a downward direction as a car travels forwards.
对于膨胀测量，通常是一个探测器依靠在一个样品上对其施加一个最小的向下的力。
For expansion measurements, a probe rests on a sample on a stage with minimal downward pressure.
压缩量：在水平放置的床垫垫面上施加垂直向下的力，引起床垫表面沿受力方向的位移量。
Compression: a mattress pad in the horizontal surface of the force applied vertically downward, causing the mattress by the force along the direction of surface displacement.
这个张力在不断增大，又因物体，无加速度-，物体受到向下的力影响-，张力必然不断增加？
So this tension goes up and up and therefore, since this object - is not being accelerated — - we're going to get a force down now on this object — this tension must increase, right?
一个巨大的物体，如地球，产生重力场。这个场对所有它表面附近的物体都产生一个向下的力。
An enormous object, like the earth, generates a gravitational field, this field causes a downward pull on all objects near its surface.
向下的力与向上的力相等，所以气球就保持在这一高度。副词成对出现，大多表示相反的意思。
The force uptown equals the force downward so that the balloon stays at the level.
为了确定拱顶的链状曲线，他会用大头针将基座草稿钉到天花板上，吊上几圈绳子，在绳子上加重，与向下的力相符。
To determine the catenary curves of arches, he would tack a sketch of a foundation plan on the ceiling, hang loops of string, and attach weights along the loops in proportion to down forces.
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。
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.
第一个威胁商业的创造力的是我们有灭绝危险的教育系统，向下去世的科学和数学，以及对于基础学科的越来越狭隘。
The first threat to business creativity is our endangered education system, with its downward trends in science and math, and its increasingly narrow focus on basic subjects.
他发现男人在站立时可以使出更多力气——而向下出手时的攻击力可以达到普通力度的两倍。
Men hit with more force when they were standing - and could punch twice as hard when they were striking downwards, he found.
如果你下降3米，就是说地球把你向下拉3米，但你也对地球施加了一个大小相等，方向相反的力。
If you fall 3 meters, the earth is pulled you down 3 meters, but you have also exerted an equal and opposite force on the earth.
现在允许你的注意力向下进入到你的心灵。
他说，这在美国历史上是第一次，我们这一代人将向下一代人移交一个不那么强大，有竞争力和有信心的国家。
For the first time in American history, he said, one generation was passing on to the next a country less powerful, compassionate, competitive and confident.
在桌面易于发生破坏的位置，按规定的力通过载入垫，垂直向下重复施加10次。每次至少应保持10秒。
On the most easy damaged position of the desk surface , to impose the specified force by loading pad, vertical put down repeated 10 times. Keep 10 seconds at least.
这导致显著减少来自火箭发动机气体在发射装置侧面部分的侧向力。而且将力向下转向和一直到离开发射装置。
This resulted in the dramatic reduction of lateral forces from rocket motor gases on lateral components of the launcher, and diverted the forces downward and away from the launcher.
水向上进入水印辊，向下透过网子，水的重新分布产生剪切力可以改善纸页的成型。
Water is driven up through the sheet into the dandy and downward through the wire; the redistribution of water causes shear on the fibers and improves sheet formation.
水向上进入水印辊，向下透过网子，水的重新分布产生剪切力可以改善纸页的成型。
Water is driven up through the sheet into the dandy and downward through the wire; the redistribution of water causes shear on the fibers and improves sheet formation.
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