So, many people have relatives they know of that have had to have their heart imaged -- heart disease is a major problem in the United States, and there's a good chance that they had Cardiolite given to them to help in that imaging process.

它被用在心脏成像中,很多人都有一些亲戚他们-,必须要做心脏成像，心脏病已经是美国的一个主要问题,而很有可能他们就要用到Cardiolite来成像。

麻省理工公开课 - 化学原理课程节选

This solves a major problem which I'm going to talk about just at the beginning of class here in a slide or two, is how to get DNA into cells?

这解决了我要讲到的一个主要问题,就是在这节开始的一两张幻灯片中要讲的,怎样将DNA导入细胞的问题

耶鲁公开课 - 生物医学工程探索课程节选

Undernutrition or hunger is a major world problem.

营养不良或说饥饿是一个世界性的大问题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选