For example, federal statutes might explicitly preempt, or explicitly waive any preemption of, state law.

例如，联邦法律可以明确的先占，或明确的取消州法律的先占。

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Businesses should be more interested in tricky questions about federal preemption of state laws and the jurisdiction of federal courts, Greve said.

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United States was mostly about federal preemption of state law.

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Of course, the Supreme Court has long recognized a strong presumption against federal preemption, which requires courts not to find state laws preempted unless that was the clear and manifest purpose of Congress.

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