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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Moreover, the potential of carbon is very close to that of lithium, when overcharge, the metal lithium will separate out on the surface of carbon, which is the intrinsic safety we must concern.

而且碳的电极电位与锂的电位很接近，当电池过充电时，金属锂可能在碳电极表面析出，形成枝晶而引发安全性问题。

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We must concern ourselves with state affairs.

我们必须关心国家大事。

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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.