The softest water wears down the hardest rock.
やわらかい水こそが固い岩を削るのよ
http://i.imgur.com/I0DB9KH.jpg id=60286593
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http://i.imgur.com/QMIRlWn.jpg id=61203979
http://i.imgur.com/3v6Nrwl.png id=60941539
http://i.imgur.com/vkpVHF0.jpg id=61434022
http://i.imgur.com/mklxoAw.jpg id=61710972
http://i.imgur.com/aH9COlK.jpg
http://i.imgur.com/JzS16E7.jpg