劍橋詞典 A, a noun (LETTER) [ 可數(shù)名詞：有復(fù)數(shù)形式的名詞 or 不可數(shù)或單數(shù)名詞：沒有復(fù)數(shù)形式的名詞 ] the first letter of the English alphabet （英語字母表的第一個字母） A, a noun (MUSIC) [ 可數(shù)名詞：有復(fù)數(shù)形式的名詞 or 不可數(shù)或單數(shù)名詞：沒有復(fù)數(shù)形式的名詞 ] a note in Western music A音 This concerto is in the key of A major . 這支協(xié)奏曲是 A 大調(diào)。 A, a noun (MARK) [ 可數(shù)名詞：有復(fù)數(shù)形式的名詞 or 不可數(shù)或單數(shù)名詞：沒有復(fù)數(shù)形式的名詞 ] a mark in an exam or for a piece of work that shows that your work is considered excellent （學(xué)業(yè)成績）A，優(yōu)，甲 Sophie got an A for English . 蘇菲英語得了個 A。 She got straight As (= all her marks were As) in her final exams . 她期末考試各科成績均為 A。 Jim is a straight -A student (= all his marks are A). 吉姆是個全優(yōu)生。 習(xí)語from A to B from A to Z 返回 A, a