奥巴马总统在西北大学凯洛格商学院发表关于经济的演讲 Hello, Evanston! (Applause.) Hello, Northwestern! (Applause.) Thank you so much. Everybody, have a seat. Have a seat. It is so good to be here. Go ‘Cats! (Applause.) I want to thank your president, Mo 英语演讲 2020-09-10 hisen
