thumbnail sketch

noun
🔊/ˌθʌmneɪl ˈsketʃ/
🔊/ˌθʌmneɪl ˈsketʃ/
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  1. a short description of something, giving only the main details简略描述
    • The first chapter provides a thumbnail sketch of the social and political climate of the US in the 1960s.第一章概述了1960年代美国的社会和政治气候。