rotation

n.旋转，轮换

rose-bud, rose-hip, rose-water, rose-window, roseate, rosebay, rosebush, rosemary, rosette, rosewood, rosin, rosiness, roster, rostrum, rosy, rot, rot-gut, rota, rotary, rotate, rotational, rotatory, rote, rote learning, rotisserie, rotor, rotten, rottenly, rottenness, rotter, rotund, rotunda, rotundity, rotundly, rouble (also ruble), roue, rouge, rough, rough house, rough luck,