In How to grow old, Bertrand Russell wrote：
An individual human existence should be like a river-small at first, narrowly contained within its ______,and rushing passionately past rocks and over______.Gradually the river grows wider,the banks recede, the ______ flow more quietly,and in the end,without any visible break, they become merged in the sea,and painlessly lose their individual being.(waters, banks, waterfalls )
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