[cháng guī]
（沿袭下来的规矩） convention; rule; common practice; groove; routine
follow the old routine
按照常规办事
break with convention; break the normal procedure
打破常规
The conventional practice flourishes in the United States.
这种常规做法在美国很盛行。
[医] routine
routine urine test
尿常规
routine blood test
血常规