It comes from racers on a circular track.

它来自圆形赛道上的赛车手。

Under French colonial rule, horse racing around a circular track was brought to Mali in the early 1900s.

在法国殖民统治下，绕着环形赛道赛马在二十世纪初传入马里。

They were rather more interested in grazing than in the 19th-century racecourse whose circular track is still evident.

他们更感兴趣的是放牧， 而不是 19 世纪的赛马场， 其圆形跑道仍然很明显。

Since mice often avoid heights, the researchers set up a holodeck with a circular running track over a floor projection.

由于老鼠经常避开高处，研究人员在地板投影上设置了一个带有圆形跑道的全息甲板。

When the muons begin to circulate and run around the magnetic ring, they sort of act like race cars going around a circular track.

当 μ 子开始循环并绕着磁环运行时，它们的行为有点像绕着圆形轨道行驶的赛车。