tough

a.坚硬的；坚强的；艰难的

totem-pole, totter, tottery, toucan, touch, touch off, touch on, touch up, touch-and-go, touch-judge, touch-line, touch-type, touchdown, touche, touched, touchily, touchiness, touching, touchingly, touchy, tough (also toughie / 5tQfI; `tQfI/), toughen, toughness, toupee, tour, tour de force, tourism, tourist, tourist class, tourist trap, tournament, tourniquet, tousle, tout, tow, tow-bar, tow-line, `tow-rope, tow-path, toward, toward(s),