- useful questions
- 常用: in common use
- 问句: questions
- 忍心（做某事），常用在否定句或疑问句中: have the heart
- 常用: in common use 常用词语 everyday expressions; commonly used words; 常用药材 medicinal herbs most in use; 砾石常用来筑路。 gravel is much used for road-making. “queer” 这个词常用作 “mad” 的委婉语。“queer” is the word often used euphemistically for “mad”.; 常用词 everyday words; often-used words; common words; 常用电压 common voltage; 常用对数 common [ordinary] logarithm; denary logarithm; brigg's logarithm; 常用卡片 active card; 常用名词表 major terms; 常用实用单位 usual practical units; 常用示波器 macrooscillograph; 常用箱 service tank
- 反问句: a rhetorical question
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