英语听力视频:如何洗手?洗手液PK肥皂杀(在线收听

 

  如何洗手最干净?洗手液-肥皂杀菌效果大对决

  Hand Sanitizers and Soaps Put to the Test

  ABC's Dr. Richard Besser compares the best ways for killing germs

  原文地址:http://www.tingroom.com/video/news/235924.html