| It could be two hours a day. It could be seven hours a day. 它也许要工做两小时，它也可能要工作七小时。 Small children sometimes stand with their parents on the treadles. 有时小孩和父母站在踏板上。 Everyone in the family can take turns operating the pump. 家里每人轮流操作这个水泵 The Acumen Fund is a nonprofit group that invests in business projects to fight poverty. 纽约商业基金是为摆脱贫困投资在商业项目上的非盈利性组织。 It studied the effects of treadle pumps in the Indian state of Uttar Pradesh. 它研究踏板水泵对印度乌塔帮连区的影响。 |
