watch one's p's and q's

英 美
  • and conj.和;加;接着;那么
  • ps abbr.附言(=postscript)abbr.著名图象处理软件(=photoshop)
  • QS abbr.质量标准(=QualityStandard)abbr.适量(=quantumsufficit(=asmuchassuffices))
  • watch v.注视;看守;观看n.手表;监视;看守;值班