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美国政府进一步限制移民，还不断收紧签证政策，并声称此举将为美国人腾出数十万个工作岗位。然而恐怕要事与愿违了。新研究发现，收紧签证只会迫使企业在海外招工和设立办事处。 President Donald Trump has been trying to encourage firms to hire more American workers by increasing restrictions on visas for skilled foreign workers, including by suspending the H-1B visa program in June. 为了鼓励企业雇佣更多美国劳动者，特朗普总统一直在不断收紧外籍技术劳工签证，包括在六月暂停临时工作签证。 | 
