短RNA干扰，小干扰RNA，双链干扰核糖核酸

think no small beer of oneself

small token of one's appreciation; small token of kindly feelings; a mere trifle

small buildings, e.g. bus SHELTERS

be small at both ends and big in the middle; a few at each extreme and many in between

small lymphocyte

fetus small-for gestational age fetus

small screw torch

small-lot manufacture