ripe/ripen
ripe/raip/adj.1.熟的，成熟的：a ripe field一片成熟庄稼的田地；ripe fruit成熟的果子；ripe scholar成熟的学者The wheat is ripe.麦子熟了。Soon ripe, soon rotten.［谚］早熟，早烂。2.时机···
ripple
ripple/ˈripl/ I.n.［c］涟漪，微波；潺潺：I heard the ripple of the stream.我听到了小溪的潺潺声。I dropped the pebble in the water, sending ripples across the pond.我往水里扔了一块···
rise
rise/raiz/ I.vi.(rose, risen) 1.升高，增长，上涨：The river (price) rose.河水(价格)上涨了。［考句］Our hopes rose and fell in the same instant.我们的希望在同一瞬间上升并下降。［考句···
risk/risky
risk/risk/ I.vt.冒…的危险（跟名词/代词、v-ing）：risk one’s life to save another冒生命危险拯救他人；risk failure冒失败的危险；risk a fall in climbing冒着跌下去的危险攀登The boatm···
ritual
ritual/ˈritʃuəl/ I.n.［c］&［u］1.(宗教等的)仪式：Christian ritual基督教仪式2.例行公事，老规矩：go through one’s ritual of doing sth.例行公事‖II.adj.1.作为仪式一部分的：ri···
rival/rivalry
rival/ˈraivəl/ I.n.［c］竞争对手，敌手：business rival营业上的竞争对手；a rival in sports运动竞赛的对手；defeat one’s rival击败对手We were rivals for the job.我们是这个工作的竞争···
river
river/ˈrivə/n.［c］河，江：the Changjiang (Yellow) River长江(黄河)；cross a river过河；deepen (widen, straighten) a river把河道加深(拓宽、拓直)；in/on a river在河上The rain cause···
road/roadside
road/rəud/n.［c］路，公路：block (build) a road阻塞(修筑)道路; follow the road沿…路走；walk along/down the road顺着路走；be in the road挡着路on the road to在通往…路上：on the ro···
roam
roam/rəum/vi.&vt.漫步，漫游：They roamed about in the park.他们在公园里漫步。Scientists have more to do than to allow their imaginations to roam at large.科学家在任其想象力自由···
