One of the key reasons gridlock happens is our inability to maintain a constant speed.

交通堵塞的主要原因之一是我们无法保持恒定的速度。

That's bizarre! It should just keep going, moving away from me at a constant speed.

这非常诡异的好吗！它应该继续前进，以恒定的速度远离我。

What we want to achive is a round link turn, which keeps my speed constant and in control.

我们想要的是一个连接处平滑的转弯，这样可以 保持滑行速度恒定，并使速度在自己的掌控中。

To be an inertial observer, one has to maintain a constant speed and direction relative to the rest of the universe.

作为惯性观测者，必须相对于宇宙的其余部分保持恒定的速度和方向。

Well, as a planet orbits the Sun it may not keep a constant speed but it does maintain its angular momentum.

当行星绕太阳运行时，它可能不会保持恒定的速度，但它的角动量会保持不变。

Light always moves at a constant speed.

光总是以恒定的速度移动。

Outside forces can change an object's direction or speed,   but constant forces create a constant speed.

外力可以改变物体的方向或速度，但恒定的力会产生恒定的速度。

For most of its journey, it's moving at a constant speed known as its terminal velocity.

在其大部分旅程中，它都以恒定速度移动，称为终端速度。

When flying along at constant speed, these forces must be perfectly balanced by the tension in the rope.

当匀速飞行时，这些力必须通过绳索的张力完美平衡。

In a 2008 experiment, drivers were instructed to drive along a circular road, following the car in front of them while trying to maintain a constant speed.

在2008年的一项实验中，司机们被要求沿着环形道路行驶。他们要在在保持恒定速度的同时跟随着前面的车辆。

Aristotle claimed that the planets were perfect spheres and moved around the earth in a circular motion and at a constant speed while the earth remained still.

亚里士多德声称行星是完美的球体，在地球静止不动的情况下，以恒定的速度绕地球旋转。

And the marble’s constant speed along the ring is equal to the maximum speed of the ball on the spring.

而弹子沿圆环的恒定速度等于小球在弹簧上的最大速度。

And the marble's constant speed along the ring is equal to the maximum speed of the ball on the spring.

并且球围绕环的恒定速度 它等于弹簧上球的最大速度。

That is why a uniform flexible cable hangs in a straight diagonal line when pulled at constant speed by a helicopter.

这就是为什么当直升机以恒定速度拉动时，均匀的柔性电缆会呈直线对角线悬挂。

First, when accelerating to higher speeds during the pulse, the engine works at a higher efficiency compared to traveling at a constant lower speed.

首先，当在脉冲期间加速到更高的速度时，与以恒定的较低速度行驶相比， 发动机的工作效率更高。

So when we, you know, so it's possible to move the craft faster than the wind, but it's not possible to move it at zero acceleration which would be needed to maintain constant speed.

因此，当我们知道时， 可以使飞行器比风更快地移动，但不可能以零加速度移动它， 而零加速度是保持恒定速度所必需的。

But, returning to our cruise control example… its code is going to have to make use of functions in other parts of the engine's software, to, you know, keep the car at a constant speed.

但是，回到我们的巡航控制示例… … 它的代码将不得不使用引擎软件其他部分的功能，以让汽车保持恒定速度。