the first letter of the Greek alphabet (Α, α), transliterated as ‘a’ 希腊字母表中第一个字母(译写为a) ■[as modifier]denoting the first of a series of items or categories, e.g. forms of a chemical compound 甲,α 项,α 类(一系列项目、分类中的第一位,如化合物的第一种形式) alpha interferon α. 干扰素。 the α and β chains of haemoglobin. α 和 β 链血红蛋白。 ■(Brit.)a first-class mark given for an examination paper or piece of school or college work (英)(学校考试成绩或作业)Α等,甲等 he had been awarded alpha double plus. 他得了A++的好成绩。 ■short for alpha test alpha test 的简称 ■(Alpha)[followed by Latin genitive](Astronomy)the first (typically the brightest) star in a constellation (天文)α 星(星座中第一颗星,多为最亮的星) Alpha Orionis. 猎户座 α 星。 ■[as modifier]relating to alpha decay or alpha particles 与 α 衰变(或 α 粒子)有关的 an alpha emitter. α 粒子发射体。 ■[as modifier]denoting the dominant animal or person in a particular group (人或动物特定群体中的)头领;首领 Turner soon proved to be the alpha male. 特纳很快便证明是男人中的头儿。
a code word representing the letter A, used in radio communication (无线电通信中字母A的代码词)A, α ;
symbol for
(α)a plane angle (平面角符号) α 角
(α)angular acceleration (角度增加符号)α
(α)(Astronomy)right ascension (天文)赤经
常用词组 alpha and omega
the beginning and the end (especially used by Christians as a title for Jesus) 首尾,始终(尤指基督徒对耶稣的称呼) ■the essence or most important features 本质,要素