astonish[]v.使惊讶;使吃惊
astound[]v.震惊
astray[]a.迷路的;误入歧途的
astrology[]n.占星学;占星术
astronaut[]n.宇航员
asymmetry[]n.不对称
at least[]至少
at random[]随便地;任意
athlete[]n.运动员
atmosphere[]n.大气;气氛;环境
