These are special chemicals, colorings or tastes that counterfeiters could not easily copy.

VOA: special.2010.03.01

Or vaccines that could be transported more easily— the hepatitis vaccine that we get is not stable unless it's refrigerated.

或者令疫苗更易于运输,现在的肝炎疫苗一定要冷藏,否则它就不稳定

耶鲁公开课 - 生物医学工程探索课程节选

And just to look ahead a little bit, you could easily imagine that I might want to not just put a statement in there, what the specs are, I might want to put some constraints. Some specific things to check for, to make sure that you're calling the code right.

这不仅是抽象的概念还有规范的概念，我们再往前看看,你可以简单的想象得到，我不仅仅是想在这里加一个声明,这些规范说明中我还想加一些约束，我们要注意一些特殊的事情。

麻省理工公开课 - 计算机科学及编程导论课程节选

And they used only materials that would not burn easily.

VOA: special.2009.07.08

Then that's not a very long distance, probably easily walkable in a few minutes; but that child can't be walking through everybody's yard.

他们离得不远,可能走几分钟就到了,但是你的孩子却不能直接走到他的朋友家

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

decide they are going to regulate the carry of guns they are forced to have a equitable system where any law-abiding citizen who is not a criminal can get that permission to carry a concealed gun easily."

VOA: standard.2010.07.06

Not that's as easily said as done.

没有说的那么简单。

哈佛公开课 - 计算机科学课程节选