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Shrewd，Astute，Perspicacious，Sagacious
敏锐的。
🚩shrewd指“天生的聪明机灵，通常是精明、圆滑，有时候也表示只顾私利，精于算计的”，柯林斯解释为A shrewd person is able to understand and judge a situation quickly and to use this understanding to their own advantage..
如：
She's a shrewd businesswoman...她是个精明的女商人。
His grey eyes were shrewd but kindly...他灰色的眼睛目光锐利却很亲切。
It should prove a shrewd investment.这将是一项精明的投资。
🚩astute指“因为博学、成熟而表现出有经验，有悟性，尤其善于借这种能力获得个人好处”，柯林斯解释为If you describe someone as astute, you think they show an understanding of behaviour and situations, and are skilful at using this knowledge to their own advantage.。
如：
She was politically astute...她很有政治头脑。
He made a series of astute business decisions.他做出了一系列精明的商业决策。
🚩perspicacious是指“具有远见卓识和非凡的洞察力”，用法比较正式，柯林斯解释为Someone who is perspicacious notices, realizes, and understands things quickly.。
如：
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
🚩sagacious是指“具有判断力和决策能力的，睿智的”，用法比较正式，柯林斯解释为A sagacious person is intelligent and has the ability to make good decisions.
如：
a sagacious leader精明练达的领导者
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