rainfall

n.降雨量

rail, railhead, railing, raillery, railroad, railway, railway-line, railwayman, raiment, rain, rain cats and dogs, rain forest, rain out, rain-check, rain-gauge, rain-swept, rain-water, rainbow, raincoat, raindrop, rainforest, rainless, rainproof, rainy, raise, raise...out of, raisin, raison d'etre, raj, rajah (also raja), rake, rake-off, rakish, rakishly, rakishness, rallentando, rally, ram, ram-jet, Ramadan,