We must concern ourselves with state affairs.

我们必须关心国家大事。

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We must concern ourselves with current affairs.

我们必须关心时事。

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Nationalism is based on nation. When investigating the conception of nationalism, we must concern the conception of nation first.

民族主义的基础是民族，对民族主义概念的探讨首先要涉及民族的概念。

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The primary concern must be whether we can use every available tool to regulate that use of force to protect innocent victims.

CNN: Syria must be held to the law of war

But there must be a concern that what we are actually seeing is a health service too ready to give patients pills for mental conditions which are helped better in other ways.

BBC: The north/south divide on antidepressants

Indeed, owing to his view that we must reduce our "trade deficit, " Bernanke expresses concern with so many dollars reaching China in exchange for the goods we Americans like.

FORBES: The Fed chairman has no idea what he's talking about.