simple machine

any simple instrument used as (part of) a machine, eg a wheel, lever, pulley 简单机械（如轮、 杠杆、 滑轮）.

silver-ware, silverside, silversmith, silverware, silvery, simian, similar, similar to, similarity, similarly, simile, similitude, simmer, simony, simoom, simper, simperingly, simple, simple fraction, simple interest, simple-minded, simpleton, simplicity, simplification, simplify, simplistic, simply, simul-taneously, simulacrum, simulate, simulated, simulation, simulator, simultaneous, simultaneously, simultaneousness, simul-taneity, sin, since, sincere, sincerely,