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。

youdao

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。

youdao