anuan.下极anart.（用在元音音素前）一an odor of antiquity古色古香an authentic antique一件真正的古董an ultimate truth.根本的事实an engaging smile.迷人的微笑an inactive oil well闲置的油井an insect society.一个昆虫群落an elevated railroad高架铁路An archery target.箭靶anemogenous scrofula风疬angiotensinogen gene血管紧张素原基因