Air-Track的意思|示意

Here is the air track.

这里是空气轨。

So here is one car on the air track, then there is a spring and there is another car.

空气轨上有一辆车，有一根弹簧，这里有另一辆车。

There is always a little bit of friction with the track, for one thing, and also, of course, with air.

和轨道,总会有一些摩擦力，当然和空气也是。

So I mentioned to you that the motion of the center of mass is very uniform in the absence of external forces, and that I can demonstrate for you again with the air track.

我向你们提到过,重心的运动是稳定的,若不受外力，我可以再次演示,在空气轨上。

Air track with a radius of 115 meters?

空甩，半径115米？

University of Oregon track coach Bill Bowerman created the first cushioned mid-sole by heating polyure-thane on his wife's waffle iron in the early 70s, which later led to the creation of Nike Air.

20世纪70年代初期，俄勒冈大学的竞赛教练比尔鲍尔曼在他太太的比利时格子饼贴膜上加热聚氨酯，打造出第一个有软垫的鞋子中底，后来促成了Nike Air运动鞋的问世。