(每日一词) observant

Observant /əbˈzɜːrvənt/ adj. 善于观察的

Meaning: Someone who is observant pays a lot of attention to things and notices more about them than most people do. 

前缀: ob- 加强语气

词根: serv- 观察, 保护 (service) 

后缀: -ant 形容词后缀 (important)

e.g. She's very observant and always knows what's happening around her. 她非常细心，总是知道周围发生了什么。