那就是，使美国法和欧盟的法律相协调。
It harmonizes United States law with that of the European Union.
欧盟的法律规定在2020年汽车制造商必须大幅度削减二氧化碳排放。
Under EU law carmakers have until 2020 to reduce CO2 emissions significantly.
但是，如果主权法暗示了欧盟的法律不能高于国内法，欧洲法院可能会宣布它无效。
If the sovereignty act suggests that EU law loses its primacy over domestic law, however, the European Court of Justice might strike it down.
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