🇺🇸突发新闻：美国公民身份和移民服务局以安全考虑为由，将非公民的工作许可有效期从5年削减到18个月。 BREAKING: The U.S. Citizenship and Immigration Services is slashing work permit validity from 5 years to 18 months for noncitizens, citing security concerns. The agency announced that the shorter work-permit windows will force more frequent background checks on noncitizens working in the U.S., which officials argue will help detect fraud, identify security threats, and remove individuals who pose a risk.