One destabilizing factor has to do with American unipolarity in the international system.
其中一个不稳定因素与美国在国际体系中的单极地位有关。
Another factor may be the relative affluence that the typical American enjoys today.
另一个因素或许是美国人对今天的生活很享受，很少抱怨。
Another factor may be the relative affluence that the typical American enjoys today.
另一个因素或许是美国人对今天的生活很享受，很少抱怨。
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