toughness

n. 有粘性,强硬,强健

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, tough (also toughie / 5tQfI; `tQfI/), toughen, 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), towards, towards the end of, towel,