noun · a bicycle or vehicle that travels at high speeds

只见一辆飞轮疾驰而过，瞬间消失在街角。

noun · a heavy revolving wheel in a machine used to store rotational energy and maintain consistent momentum

发动机的飞轮对于维持平稳运转至关重要。

noun · the rear sprocket set or cassette of a bicycle that allows the wheel to spin independently of the pedals

这辆自行车的飞轮出现了打滑的现象。