association n.协会

assume v.假定;设想

assumption n.假定;假设

assurance n.信心;保证;保险

asthma n.哮喘症

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