roughen 英 ['rʌf(ə)n] 美 ['rʌfn] 基本解释 v.(使)变粗糙 同首字母单词 ra [ˈrɑː] raa raad ['rɑːd] raaf rabassaire [rəbə'seər] rabat rabaul rabbah rabbanist rabbanite rabbath rabbet ['ræbɪt]