这是角度dθ,它运动了一会儿,运动过角度dθ,弧度是，半径是。
Let this be the angle d theta so it moves in a short amount of time over an angle d theta dS and the arc here is dS, R and the radius is R.
你必须选择正确的股票，预测它运动的程度，还要预测它运动的快慢。
You must choose the right stock, predict the extent of its move, and forecast how fast it'll get there.
在那时候，开普勒尝试观察天上行星的移动，并尝试提出它运动的理论。
So, what happened back then was Kepler was trying to observe the motion of planets in the sky, and trying to come up with general explanations of how they move.
这种运动的存在，无可奈何地暗示着身体是运动的，有一种力量令它运动。
The existence of movement unavoidably implies a body which is being moved and a force which is moving it.
而后上臂的肱三头肌则是一块伸肌，当它运动时，肘部就伸直，而前臂和手就离开了肩部。
The tricepes muscle in the back of the upper arm is an extensor. When it contracts, the elbow strainghtens and the forearm and hand move away from the shoulder.
因此，现实中发热的物体，例如火，使潜在能发热的物体木材实际上发热，从而使它运动和变化。
Thus that which is actually hot, as fire, makes wood, which is potentially hot, to be actually hot, and thereby moves and changes it.
因此，我们的身体不断地把旧物质替换成新的，就像一个喷泉，或多或少地保持着它的形式和运动，但其中的水分子总是不同的。
Thus our bodies continuously exchange old substance for new, just like a spring which more or less maintains its form and movement, but in which the water molecules are always different.
家庭教育运动的批评者认为，它带来的问题和解决的问题一样多。
Critics of the home schooling movement content that it creates as many problems as it solves.
在这种反向耦合中，移动板的位置对移动它的力有影响，可以产生变化的复杂运动。
Such a back-coupling, in which the position of the moving plate has an impact on the forces that move it, could produce complicated and varying motions.
它没有宗教意义；该运动的创始人将其作为对瑞士的致敬。
It has no religious significance; the founders of the movement adopted it as a tribute to Switzerland.
运动狩猎的一个常见辩护是，它提供了至关重要的野生动物管理功能，没有它，无数的动物将会死于饥饿和疾病。
A common defense of sport hunting is that it serves a vital wildlife-management function, without which countless animals would succumb to starvation and disease.
场上的成功和对运动的高度参与并不是随机的——它需要对运动的专注和奉献。
On-the-field success and high participation in sports is not random—it requires focus and dedication to athletics.
海水在不断地运动，而水温既是这种运动的原因，也是它的结果。
Ocean waters are constantly moving, and water temperature is both a cause and an effect of this movement.
随着海洋变暖，一种被称为南极极锋的水体正被逐步推向南方；南极极锋是一种富含营养的海洋向上运动，它支持着大量海洋生物的生存。
As the ocean warms, a body of water called the Antarctic Polar Front—an upward movement of nutrient-rich sea that supports a huge abundance of marine life—is being pushed further south.
它的宣传运动可能会给人一种强求和保护过度的感觉。
Its campaign risks coming across as being pushy and overprotective.
如今，彩虹被许多倡导和平与环保的流行运动所使用，它代表着在黑暗中建设一个更美好的世界的可能性，以及雨后的阳光前景。
Nowadays the rainbow is used by many popular movements for peace and the environment, representing the possibility of a better world in the Mure and promising sunshine after the rain.
这种为了获得更多广告收入的想法太厚颜无耻，没有考虑到这项运动的完整性，而且它的本质在于动作的流畅性。
The idea is unashamedly to capture more advertising revenue, without giving any thought for the integrity of a sport which relies for its essence on the flowing nature of the action.
它参与了反竞争运动。
但是，我们对国际考试成绩进行解读后，发现它并不支持对于学校体育运动的反对论点。
But our reading of international test scores finds no support for the argument against school athletics.
它起源于伟大的户外运动，但其结果却像特纳和康斯特布尔的画作一样被画廊所束缚。
It had its origins in the great outdoors, but the results were as gallery-bound as the paintings of Turner and Constable.
它类似于你可能在美国低端商场里找到的那种小型运动鞋商店。
It resembles the kind of small sneaker store you might find in a low-end American mall.
它的影子显示了太阳的运动。
它适合所有喜欢冒险或喜欢运动的人。
It's for everyone—people who love taking risks or who just like sports.
凯特琳是一位年轻的德国初学者，她说：“太极拳是一种有趣的运动，很容易学，你不需要擅长就能享受它。”
Caitlin, a young German beginner, says, "Tai chi is a fun exercise, easy to learn, and you don't have to be good at it to enjoy it".
所以，现在更有趣的是，我们可以更加详细地分析它的运动。
So, now, what's interesting about this is we can analyze the motion in more detail.
海滨银行也许已经失败，但是它曾领导的运动却愈加兴旺。
ShoreBank may have failed, but the movement it once led is stronger than ever.
蛤蚌的运动使得它周围的沙子形成一种流体- - -本质上是流沙。
The clam's movements turn the sand around the creature into more of a fluid-basically quicksand.
相反地，一个很小的角色有比正常角色更小的惯性，所以它的运动趋向要更快一些。
Conversely, a tiny character has less inertia than normal, so his movements tend to be quicker.
我在做运动,它叫做太极拳.
我在做运动,它叫做太极拳.
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