Environment: riding on the roof of the world.
Qiu
Jane
J
D000531:Altitude; D000818:Animals; D002681:China; D003081:Cold Climate; D004190:Disasters; D017753:Ecosystem; D004641:Emigration and Immigration; D005843:Geography; D006801:Humans; D011890:Railroads / Q000191:economics / Q000592:standards; D018609:Tibet