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prairie cumulus clouds mountains sky clouds nature weather landscape beautiful spectacular magnificent prairie landscape mountain landscape natural landscape outdoor activities travel vacation leisure relaxation decompression recuperation rehabilitation convalescence enjoyment cultivation 陶冶情操 purification of the mind return to nature close to nature feel nature enjoy nature nature heaven and earth universe all things life survival development change movement law mystery exploration discovery knowledge learning research science technology progress development innovation creation invention design manufacturing use maintenance repair 保养 update iteration upgrade replacement 淘汰 报废 circulation utilization protection environment ecology balance harmony symbiosis dependence correlation influence action result consequence unknown mystery unpredictable incomprehensible uncontrollable awe respect gratitude cherish love care protect guard responsibility 担当 mission belief ideal pursuit goal direction road future destiny future