脑汁 nǎozhī mental energy Origin Definitions Defs Strokes Stroke Words Sentences Sents 绞尽脑汁 jiǎojìnnǎozhī to rack one's brains to strain one's mind to the limit; to think very hard about something绞脑汁 jiǎonǎozhī to rack one's brains to think very hard about something; to use a great deal of mental effort