stopwatch

n.(赛跑用的)跑表;vt.用秒表测定时间

stool-pigeon, stoop, stop, stop by, stop off, stop press, stop short, stop to do sth., stop-go, stop-light, stop-press, stop-watch, stop...from, stopcock, stopgap, stopover, stoppage, stopper, stopping, stopping train, storage, storage heater, store, store up, store-room, storehouse, storekeeper, storeroom, storey, storey (US story), stork, storm, storm petrel (also stormy petrel), storm-bound, storm-centre, storm-cloud, storm-door, storm-lantern, storm-tossed, storm-trooper,