Lesson 7 They Serve Inexpensive Food To People. 快餐店给人们提供不太昂贵的食物 Are you ready to go? Almost. 你准备走了吗? 差不多了。 I'm glad you're directing this story. Mike. 我非常高兴你能够导演这个节目,迈...
By Steve Mort Orlando, Florida 16 January 2007 watch Cheap Vaccines report A U.S. scientist is developing a method to produce inexpensive vaccines against disease. Professor Henry Daniell, from the University of Central Florida, has found a way to g...