History teaches us that every problem has a lifespan, No problem is permanent.

历史教育我们，每个问题都有它的周期，没有问题是永久的。

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History teaches us that every problem has a lifespan. No problem is permanent.

历史告诉我们，每个难题都只存在于一段时间，没有永远解决不了的难题。

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History teaches us that every problem has a lifespan. No problem is permanent.

历史告诉我们每一个难题都有始有终，任何难题都不会永远存在。

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History teaches us that both prosperity and freedom hang on a respect for property rights.

FORBES: When Ducks Trample Your Liberties

And despite what the cynics say, history teaches us that there is a different path.

WHITEHOUSE: President Obama on Bilateral Mideast Peace Meetings

History teaches us the greatest force the world has ever known for creating wealth and opportunity is free markets.

WHITEHOUSE: President Obama Speaks to the Australian Parliament