observant
/əbˈzɜ:vənt; əb`zəvənt/ adj
1 quick at noticing things 善於观察的; 机警的; 注意的
An observant shop assistant had remembered exactly what the man was wearing. 有个机警的店员准确记得那个男子的穿著.
Journalists are trained to be observant. 新闻记者都要训练成有敏锐观察力的人.
2 (fml 文) careful to observe(2a) laws, customs, traditions, etc （对法律、 习俗、 传统等）谨慎遵守的
observant of the rules 遵守规则.