音标发音英式音标 [ɑː ˈeɪ]美式音标 [aːr ˈeɪ]英式发音 美式发音 基本解释橈動脈（radial artery的縮寫）, 右心房（right atrium的縮寫）。同根派生 RA相关词英英字典劍橋英英字典 abbreviation for radial artery: the artery (= large blood vessel) that goes from below the elbow to the palm of the hand abbreviation for right atrium: the right upper chamber (= space) of the heartRA剑桥字典RA柯林斯字典