A river cuts through rock, not because of its power, but because of its persistence.

河流可以穿过岩石，并非因其力大无穷，而是因为它坚持不懈。--吉姆·沃特金斯

语言点：persistence
n. 持续；固执；存留；坚持不懈；毅力
【短语】
happiness consists in contentment 知足常乐；幸福在于满足

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