Respected teachers, my fellow students. Today my topic is save resources, better tomorrow. As we all know, the pollution problem may be one of the greatest problems in the world. Please look out of th
Shep, thank you so much for coming. I think your plane landed literally two hours ago in Vancouver. 克里斯·谢普，感谢你的到来。我听说你乘坐的航班两个小时前刚到达温哥华。 Such a treat to have you. So, talk us through how do you get fro
Thank you. 谢谢大家。 I have only got 18 minutes to explain something that lasts for hours and days,so I'd better get started. 我只有18分钟的时间来讲一件持续了数天数夜的事情，所以最好述不宜迟， Let's start with a clip from Al Jaz
