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一 |     WASHINGTON -- The Supreme Court on Monday ordered two internet sellers of gun parts to comply with a Biden administration regulation aimed at ghost guns, firearms that are difficult to trace because they lack serial numbers.The court had intervened once before, by a 5-4 vote in August, to keep the regulation in effect after it had been invalidated by a lower court. No justice dissented publicly from Monday's order, which followed a ruling from a federal judge in Texas that exempted the two companies, Blackhawk Manufacturing Group and Defense Distributed, from having to abide by the regulation of ghost gun kits.Other makers of gun parts also had been seeking similar court orders, the administration told the Supreme Court in a filing.“Absent relief from this Court, therefore, untraceable ghost guns will remain widely available to anyone with a computer and a credit card — no background check required,” Solicitor General Elizabeth Prelogar, the administration's top Supreme Court lawyer, wrote. The regulation changed the definition of a firearm under federal law to include unfinished parts, like the frame of a handgun or the receiver of a long gun, so they can be tracked more easily. Those parts must be licensed and include serial numbers. Manufacturers must also run background checks before a sale — as they do with other commercially made firearms. The requirement applies regardless of how the firearm was made, meaning it includes ghost guns made from individual parts or kits or by 3D printers.The regulation will be in effect while the administration appeals the judge's ruling to the 5th U.S. Circuit Court of Appeals in New Orleans — and potentially the Supreme Court.。    新华社深圳4月20日电（记者王浩明）2024全国游泳冠军赛20日进入第二个比赛日，唐钱婷超女子100米蛙泳亚洲纪录，张雨霏女子100米蝶泳夺冠。　　4月20日，唐钱婷在女子100米蛙泳半决赛后庆祝。新华社发（彭志刚摄）　　女子100米蛙泳半决赛上演高光时刻，唐钱婷出发后一路领先，最终游出1分4秒68，超过了该项目的亚洲纪录，这个成绩比她在今年2月卡塔尔世锦赛1分5秒27的夺金成绩提高了0.59秒，这也让唐钱婷成为亚洲第一位在女子100米蛙泳项目上游进1分5秒的选手。　　女子100米蝶泳决赛，奥运冠军张雨霏以56秒36拿下本次比赛个人第二金，余依婷摘得银牌，王一淳获得第三名。　　男子100米蛙泳决赛中，世锦赛三冠王覃海洋以58秒24夺金，孙佳俊获得银牌，董志豪获得铜牌。男子400米个人混合泳决赛中，黄志伟以4分16秒33拿下冠军，领先第二名陈诺超过5秒，李易峰摘得铜牌。