美 [ˈrɑː]
abbr. 皇家学院（Royal Academy）；随机存取（Random Access）；研究协会（Research Association）；赤经（Right Ascension）
RA //
rear admiral 海军少将
an intensely radioactive metallic element that occurs in minute amounts in uranium ores
同义词： radium / atomic number 88
ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods
同义词： Re
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere
注册机构 (registration authority)
速率适配 (rate adaptation)
注册机构 (registration authority)
类风湿性关节炎
那么类风湿是什么原因导致，为何又如此偏爱女性类风湿性关节炎（RA）是一种伴急性发作的慢性的确多发性关节病变结缔组织病的一种初期以关节滑膜病变为主逐步侵犯肌腱韧带等结缔组织后期发生软骨与骨...
...何实现COB高的显色指数CRI时，陈文成博士表示，COB平面光源显色（CRI）是指COB面光源照射物体真实颜色的呈现程度。显色指数（RA）是光源对物体的显色能力。目前COB平面光源提高显色指数最常用的方法是加红粉，红粉的选择关系到COB平面光源的光效及稳定性。
类风湿关节炎(RA)是一种自身免疫性疾病,具有慢性反复发作的特点。目前治疗类风湿关节炎虽然取得了一定的疗效,但长期服用副作用较大,甚至出现造血系...
表面粗糙度(Ra)是评价工件已加工表面质量的最主要参数。表面粗糙度的大小影响着零件的抗腐蚀性、抗疲劳性、耐磨性、装配精度和配合性质的稳定性...
So if the symbol were Coptic, the first symbol would be "ra".
所以如果这个符号是科普特语，第一个符号就是“ra”。
If the symbol were Coptic, the first symbol would be "ra" and then an unknown symbol followed by a double "S" sound.
所以如果这个符号是埃及古语，第一个符号应该是“ra”，然后是一个未知的符号，后面跟着一个双“S”音。
This RA can register users and manage certificate requests without having direct access to the certifier ID and password.
这个 RA 可以注册用户并管理证书请求，而不需要直接访问证明者 ID 和口令。
Israeli analyst Ra'anan Gissin. "The strategic thinking has to be, first of all, to have sufficient intelligence but also the right intelligence, so that we can forestall, so that we can prevent this from happening right from the beginning."
VOA : standard.2010.07.12
that if I don't want to be an RA, or residence assistant, I can be working in the apartments
如果我不想当宿管助理员，我可以在公寓工作，
SpeakingMax英语口语达人 : 热门兼职
Al-Ra'y TV is owned by Iraqi businessman Mishan al-Juburi and based in the Syrian capital, Damascus.
At a packed pep rally at a downtown restaurant, fans serenaded Johnson with chants of "Sac-ra-mento!"
Surrey Con 55, Lib Dem 13, RA 10, Ukip 1, Lab 1 all seats up.
“ra”是个多义词，它可以指ra（新型流式音频RealAudio文件格式）, ra（词条缩写）, ra（表面粗糙度）, ra（研究助理）, ra（古埃及赫里奥波里斯的太阳神）, ra（游戏名称：红色警戒(RedAlert)）, ra（生活顾问 RA(Residential Advisor)）, ra（美国乐队Ra）, ra（天文术语：赤经）, ra（美国标准的粗糙度符号）, ra（数字证书注册中心）, ra（化学元素符号）。