Nighttime celebrations filled the air in Iraq as people marked the start of a four-day national holiday known as Sovereignty Day. The holiday celebrates the complete withdrawal of United States military troops and international forces from the country.
filled the air= 形容氣氛或聲音瀰漫於整個空間
International forces spent more than a decade in Iraq fighting the militant group ISIL. With the military mission now finished, foreign troops have fully departed.
spent ... fighting= 表示花費一段時間進行打擊或戰鬥
The end of the military mission allows Iraqis to observe their four-day holiday and mark a new period for the country without international military forces present.
allows ... to observe= 表示使某人能夠度過或慶祝特定節日