级差

differential (between grades) / salary differential

difference; discrepancy / (math.) difference (amount remaining after a subtraction) / (literary) a little; somewhat; slightly

different / wrong; mistaken / to fall short; to lack / not up to standard; inferior / Taiwan pr. [cha1]

to send (on an errand) / (archaic) person sent on such an errand / job; official post

used in 參差|参差[cen1 ci1]

level / grade / rank / step (of stairs) / CL:個|个[ge4] / classifier: step, level