frown记忆法

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en.wikipedia.org

Frown - Wikipedia

A frown (also known as a scowl) is a facial expression in which the eyebrows are brought together, and the forehead is wrinkled, usually indicating displeasure, sadness or worry, or less often confusion or concentration.

www.wordreference.com

frown - WordReference.com Dictionary of English

frown /fraʊn/ v. to wrinkle the forehead, such as when one is displeased or in deep thought: [no object] She frowned when I gave the wrong answer. [~ + at + object] She frowned at the dog.