[cháng guī]
（沿襲下來的規矩） convention; rule; common practice; groove; routine
follow the old routine
按照常規辦事
break with convention; break the normal procedure
打破常規
The conventional practice flourishes in the United States.
這種常規做法在美國很盛行。
[醫] routine
routine urine test
尿常規
routine blood test
血常規