【化】 internal reference; internal standard
inner; inside; within
【医】 end-; endo-; ento-; in-; intra-
criteria; level; mark; measure; normal; par; rule; standard; criterion
【计】 etalon; normal; STD
【化】 standards
【医】 norm; normo-; rubric; standard
【经】 denominator; norm; standard