Doctors first used chemicals to destroy the children's own marrow, then replaced it with healthy marrow.

VOA: special.2009.12.16

So one of the first things that I'll argue for in terms of " healthy research is "let's also focus on what is working".

首先，我认为在健康研究方面,主要的问题是“让我们注重可行的方法。

哈佛公开课 - 幸福课课程节选

I'd actually like to explore a slightly alternate possibility of just taking the one of the five who needs an organ who dies first and using their four healthy organs to save the other four.

其实我想知道可否稍微变通一下,就是选择五人中最先死的那人,利用他的器官来救其他四人。

耶鲁公开课 - 公正课程节选

The first lady has launched a program to motivate school children to eat healthy and to exercise.

VOA: standard.2010.03.09