The video owner has disabled playback on external websites.
This video is no longer available on YouTube.
This video cannot be played right now.
Watch on YouTube
互动模式
测验
正确！
不太对。
正确答案：
相关视频
Is it time to worry about bird flu?
B2
7:45
Why China’s Ports Empire Has the US Worried
B1
10:46
Princess Mary's children talk about her dedication when preparing speeches and to other royal duties
B1
1:03
How China is preparing for conflict with India
B2
16:23
Dana Walden on the Future of Disney | The Circuit
B1
22:47
Vox
测验
正确！
不太对。
正确答案：
观看视频时会出现测验
记忆技巧
来自此视频
免费开始学语言
