motivation

n.动机;动力

mother's boy, Mother's Day, mother-in-law, mother-of-pearl, mother-to-be, motherhood, motherland, motherless, motherlike, motherliness, motherly, mothproof, motif, motile, motility, motion, motion picture, motionless, motivate, motivated, motivational, motive, motiveless, motley, motor, motor bike, motor boat, motor car, motor cycle, motor-engine, motor-scooter, motor-way, motorbike, motorcade, motorcar, motorcycle, motoring, motorist, motorize, motorise, motorway,