The well-seasoned coach could accurately assess each athlete's potential.

well-seasoned 是由副词 well（很好地）和形容词 seasoned（调味的、经验丰富的）组成的复合形容词。seasoned 来自动词 season（调味），引申为"经过时间调味的"，即"经验丰富的"。 well-seasoned 字面意思是"调味很好的"，比喻为"经验非常丰富的"，形容人经过长期实践积累了丰富经验。