常规

There is no rule without an exception.

in the usual course; according to conventional practice

follow the common practice; follow the old routine; follow the ordinary rules; do sth according to routine; do sth in accordance with the conventions

think in a groove

conventional/general practice

conventional equipment

routine job/work

conventional programme

observe the conventional practice

follow the common practice; follow the old routine; be stuck in the old grooves; fall into a rut

disregard the conventions; disregard the established rules

go against/violate the established rules; run counter to conventions

conform to conventions; accord with the routine; be stuck in the old grooves

break (with) conventions; break out of a routine/rut; break up a routine; break the normal procedure; break out of the groove; go off/leave the beaten track

have a routine blood/urine test