a 开头单词
a favourite son n. 宠儿
a fellow of vain pretentions 空心大老倌
a fellow who pursues rancidness 逐臭之夫
a felony [法学]重罪
a few days ago 几天前
a few weeks ago 几周前
a flexible diaphragm coupling [机械工程]弹性膜片联轴器
a flight attendant 一名机组乘务员一个空中服务员
a flight of stairs 一段楼梯
a flock of 一群（鸟，羊等）
a flock of sheep 一群羊
a flute-like ancient instrument 琯
a flying start 良好的开端（赛跑的）快速起跑