risky

a.危险的，冒险的

rip-off, rip-roaring, rip-saw, rip-tide, riparian, ripe, ripen, ripeness, riposte, ripple, rise, rise superior to, riser, risible, rising, rising damp, rising fives, risk, riskily, riskiness, risotto, risque, rissole, rite, ritual, ritualize, ritzy, rival, rivalry, rive, riven, river, river bed, river-bed, riverside, rivet, riveter, riveting, Riviera, rivulet,