Each one works with 2,000 people. The field officers go from house-to-house, person-to person to get each individual to become active in the fight against HIV/AIDS.

VOA: standard.2010.07.01

They subtract this from the purchase price of the house and then you've got the cash to go and buy another house.

他们从售房价格里减去这个贷款余额,然后你就可以得到现金去买另一个房子

耶鲁公开课 - 金融市场课程节选