They can be entrusted to solve major national problems.

他们能受托解决重大国家问题。

《柯林斯英汉双解大词典》

But America has big national problems.

可是美国国内也有较大的问题。

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We should work together on the solution of our national problems.

我们应该一起解决我们国家的问题。

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We should work together on the solution of our national problems.

我们应该一起解决我们国家的问题。

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