奥巴马每周电视讲话:总统呼吁保护所居住的地球
Hi,everybody.Our country is home to some of the most beautiful God-given landscapes in the world.We're blessed with natural treasures-from the Grand Tetons to the Grand Canyon; from lush forests and vast deserts to lakes and rivers teeming with wildlife.And it's our responsibility to protect these treasures for future generations,just as previous generations protecte...