短语词组短語savanna forest 稀瘦原林water savanna 水澤熱帶草原flood savanna 泛濫平原pyrogenic savanna 火成熱帶草原secondary savanna 次生性稀樹草原succulent savanna 肉質植物稀瘦原mountain savanna 山地稀樹草原steppe savanna 稀樹乾草原humid savanna 潮溼稀樹草原 返回 savanna