A2
n. 主动脉第二声；亚细亚流感病毒
例句
He's doing an A2 (level) in History.
他正在学习A2证书考试的历史科目。
《牛津词典》
Students will normally take three A2 subjects.
学生通常要选三门A2证书考试科目。
More than 20 subjects are on offer at A2 level at our college.
本校提供20多门A2证书考试课程。
