running water 怜水 running water level 怜水水位 runoff coefficient 径恋数 runoff process 径笼程 runoff regime 径链况 rupture 断裂 rural environment 农村环境 rural hygiene 农村卫生 rural settlements 村庄 rush marsh 灯心草沼泽 russian forest spring encephalitis 春季森林脑炎 rust colored forest soil 潜育灰化土 rust fungus 锈菌 ruthenium 钌 rutherfordine 纤碳铀矿 rutile 金红石