Ronald Reagan's address on the space shuttle "Challenger" tragedy (28 January 1986) Ladies and Gentlemen, I'd planned to speak to you tonight to report on the state of the Union, but the events of ear
Obama's Weekly Address WEEKLY ADDRESS: Ensuring 2014 is a Year of Action to Grow the Economy 奥巴马每周电视讲话:总统呼吁确保2014成为推动经济增 Hi, everybody. 大家好！ Yesterday, we learned that in 2013, our businesses created
So they're learning from each other. And research bears this out. 乌鸦通过互相学习，都掌握了这种技巧。 Parents seem to be teaching their young. They learn from their peers, they learn from their enemies. 乌鸦父母还教会自己的孩子这样
