Drug-related violence in Mexico has killed more than seven thousand people since the beginning of last year -- often with guns bought in the United States.

VOA: special.2009.04.18

We can do that sort of: When you play tic-tac-toe with your seven-year old nephew or niece, you just look ahead and work backwards.

我们可能会这么做,当你和你七岁大的侄子或侄女,下三子棋的时候,你就会先预测,然后想

耶鲁公开课 - 死亡课程节选

We can do that sort of: When you play tic-tac-toe with your seven-year old nephew or niece, you just look ahead and work backwards.

我们可能会这么做,当你和你七岁大的侄子或侄女,下三子棋的时候,你就会先预测,然后想

耶鲁公开课 - 死亡课程节选