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mountain mountain range mountain valley hill grassland green land white cloud blue sky nature outdoor scenery beautiful magnificent grand towering continuous undulating winding rugged steep precipitous secluded empty lonely desolate uninhabited quiet peaceful serene harmonious unified complete perfect eternal infinite cycle recurrence unceasing perpetual thriving flourishing prospering booming rapidly developing 勢如破竹 雷霆萬鈞 摧枯拉朽 不可阻擋 浩浩蕩蕩 源源不斷 取之不盡 用之不竭 生生不息 循環往復