那是因为，国会总是期待联邦和州共同实施移民法规，并明确鼓励各州官员共享信息，与联邦同僚合作。
That's because Congress has always envisioned joint federal-state immigration enforcement and explicitly encourages state officers to share information and cooperate with federal colleagues.
他还说：“假如有其他方式能在目前生活的地方适应气候变化，民众是没有必要移民的。”我鼓励决策者们向这方面考虑。
"One of the things I encourage policymakers to think about is that people don't have to migrate if they have other means of adapting to climate change where they already live," he added.
在领导者考虑这种前景、并积极参与有关削减养老金、鼓励生育和扩大移民的烦人争论之际，一些专家告诉我们无须担心。
As leaders ponder this prospect - and wade into nasty debates about pension cuts, incentives to have children and immigration expansion - some experts tell us not to worry.
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