上周，科学家们警告说，世界上三分之一的北极熊可能会在未来40年里消失。

Last week the scientists warned that a third of the world's polar bears could disappear in the next 40 years.

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世界上三分之二的淡水都存于冰川之中。

Two-thirds of the world’s fresh water is stored in glaciers.

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如果不能忍受，可以随时摇铃退出，事实上三分之二的人会这样做。

Men can ring a bell to quit at any time, and two out of three do so.

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Daily Show I think. Additional third this year did it because Tal was on the Jon Stewart Daily Show.

我想，今年还有三分之一的人选这门课是因为Tal上了Jon，Stewart的。

哈佛公开课 - 幸福课课程节选