Someone who is perspicacious notices, realizes, and understands things quickly.
例句
...one of the most perspicacious and perceptive historians of that period.那个时期最敏锐、最有洞察力的历史学家之一
英汉词典释义
adj.
有洞察力的;判断力强的;有识别力的
a perspicacious criticism尖锐的批评
英英词典释义
Adjective
1. acutely insightful and wise;
"much too perspicacious to be taken in by such a spurious argument""observant and thoughtful, he was given to asking sagacious questions""a source of valuable insights and sapient advice to educators"
2. mentally acute or penetratingly discerning;
"too clear-eyed not to see what problems would follow""chaos could be prevented only by clear-sighted leadership""much too perspicacious to be taken in by so spurious an argument"