Podowski and others said most of the existing U. s. nuclear reactors are reaching the end of their lifespans.

波多斯基和其他人都说，美国显存的大部分核反应堆都快要到达寿命了。

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The shockwave is noisy, but it can also cause structural damage, and in the Concorde's case, the U. S. wasn't having it.

这种冲击波不仅非常吵，而且会导致结构性破坏，所以协和式飞机没有在美国获得适航。

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These in turn, the dependence on imports form the second wave of impact the U. S. economy.

而这些反过来，又形成对依赖进口的美国经济的第二波冲击。

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