People are being urged to wash their hands carefully with soap and purified water after using the toilet or changing a baby's diaper.

VOA: special.2010.11.10

I'm not taking a cut on that either, all right, there's no money changing hands.

我不会从中得到提成,这不是推销

耶鲁公开课 - 博弈论课程节选

I'm not taking a cut on that either, all right, there's no money changing hands.

我不会从中得到提成,这不是推销

耶鲁公开课 - 博弈论课程节选