be a study in something = literary to be a perfect example of something
His face was a study in fear.
Case in point
نمونه ی بارز: نمونه ای روشن، نمونه ی آشکار، نمونه ی واضح - یک مورد مناسب مثال زدنی
paragon, exemplar, paragon, shining example, perfect example, archetype
