1.The WHO says the studies should be done in low- and high-income countries because the poorer countries have special problems they have to work out for themselves.
work out 解决;算出;实现;制定出;消耗完;弄懂;找到 (解决办法等)
Negotiators are due to meet later today to work out a compromise.
谈判者们预定在今天晚些时候会面以找到一个折中的办法 。
It took me some time to work out what was causing this.
它花了我一些时间,找到导致这种状况的原因 。
2.He says that decision is paying off in better health for their people.
pay off 付清;(某行动) 取得成功; 带来好结果;贿赂;报复
Sandra was determined to become a doctor and her persistence paid off.
桑德拉决心成为一名医生,她的坚持不懈终于带来了成功 。
he investor believes that his investment will pay off handsomely soon.
这个投资者相信他的投资不久会有相当大的收益 。