freewheel
/ˌfriːˈwiːl/ 10If you freewheel, you travel, usually downhill, on a bicycle without using the pedals, or in a vehicle without using the engine. (骑自行车或开车时)凭惯性前进
verb [vt. 及物动词]（骑自行车或开车时）靠惯性滑行；随心所欲
He freewheeled back down the course. 他靠惯性滑行返回路途。
noun [专属名词]（自行车的）飞轮；（汽车的）自由轮
The reverse recovery properties of the freewheel diode are also distinctly improved. 续流二极管的反向恢复特性也得到了明显改善。
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