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奧巴馬總統(tǒng)在華盛頓核安全峰會開幕式上的致辭
PRESIDENT OBAMA: Good morning, everybody. It is my privilege to welcome you to Washington and to formally convene our fourth Nuclear Security Summit. I convened our first summit – s...
聽力計劃063
貓姐問早安-聽力一起練
貓姐問早安，聽力一起練
貓姐問早安--聽力一起練
