The last year has been a time of great challenge and great progress for our country.

对美国来说，过去的一年是拥有巨大挑战和巨大成就的一年。

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Only by challenge our limits again and again, can we make progress constantly.

只有不断挑战自己的极限，才能让自己不断进步。

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Only by challenge our limits again and again, can we make progress constantly.

只有不断挑战自己的极限，才能让自己不断进步。

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