自由輪傳動; 單向轉動
freewheeling adj 1: free of restraints or rules; "freewheeling foolishness"; "the versatility of his poetic freewheeling style" 2: cheerfully irresponsible; "carefree with his money"; "freewheeling urban youths"; "had a harum-scarum youth" [syn: {carefree}, {devil-may-care}, {happy-go-lucky}, {harum-scarum}, {slaphappy}]