如果您曾经这么做过——平举着一个正在旋转的自行车车轮，然后试图将它向任意方向倾斜——您就会知道，这时车轮本身会将您的手往回拽，努力保持在它原来的旋转平面上。

If you've ever held a bicycle wheel while it's turning and tried to reorient it you know that the wheel itself pushes back, trying to remain in its original plane.

youdao

这些都是昂贵的，然而，你可能更喜欢简单地放置在您的自行车车架或前叉和真正在那里的车轮。

These are costly however so you might prefer to simply place the wheel in your bicycle frame or fork and true it there.

youdao

传感器在某一位置处固定连接于自行车制动器上以便通过检测安装于气阀杆上的磁铁来检测自行车车轮的旋转行为。

The sensor is fixedly attached to the bicycle brake at a location to detect rotational behaviour of a bicycle wheel by sensing the magnet mounted to the air valve stem.

youdao