subtraction

n.减法，减去

substitute, substitute for, substitute...for, substitution, substratum, substructure, subsume, subtenancy, subtenant, subtend, subterfuge, subterranean, subtitle, subtle, subtlety, subtly, subtopia, subtopic, subtotal, subtract, subtropical, suburb, suburban, suburbanite, Suburbia, subvention, subversion, subversive, subversively, subversiveness, subvert, subway, subzero, succeed, succeed in, succeed in doing, succeed in sth., success, successful, successfully,