形容詞 observant:

1. paying close attention especially to details
2. quick to notice; showing quick and keen perception
   同義詞：observing
3. (of individuals) adhering strictly to laws and rules and customs
   同義詞：law-abiding

1. An observant shop assistant had remembered exactly what the man was worn.
   有個(gè)機(jī)警的店員準(zhǔn)確記得那個(gè)男子的穿著。
2. An observant shop assistant had remembered exactly what the man was wearing.
   有個(gè)機(jī)警的店員準(zhǔn)確記得那個(gè)男子的穿著。
3. Journalists are trained to be observant.
   新聞記者都要訓(xùn)練成有敏銳觀察力的人。

ob.ser.vant

adj.（形容詞）
Quick to perceive or apprehend; alert:
敏感的，敏銳的：迅速感覺的或理解的；敏感的：
例句：
an observant traveler.See Synonyms at careful
一個(gè)感覺敏銳的旅行者參見 careful

Diligent in observing a law, custom, duty, or principle:
遵從的：不倦于遵守法律、習(xí)俗、責(zé)任或規(guī)則：
例句：
observant of the speed limit.
遵守速度限制

【引伸】
obser.vantly
adv.（副詞）