奥巴马每周电视讲话:总统呼吁减少碳排放
Hi, everybody. 大家好！ I'm here at Children's National Medical Center in Washington, D.C., visiting with some kids being treated here all the time for asthma and other breathing problems. 此刻，我在华盛顿特区的国家儿童医疗中心，看望在这里接受治疗的哮喘和其它呼吸系统疾病的患儿。 Often, these illnesses are aggravated by air pollution-pollution from the same sources th...