rain-water

n soft water that has fallen as rain, eg not taken from wells, etc 雨水（软水, 如并非井水等）.

ragweed, ragwort, raid, raider, 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, rainbow, raincoat, raindrop, rainfall, rainforest, rainless, rainproof, rainy, raise, raise...out of, raisin, raison d'etre, raj, rajah (also raja), rake, rake-off, rakish, rakishly, rakishness, rallentando,