He says that is because the farmer used rich soil to produce the sod, so it might not do well in clay soils.

VOA: special.2009.07.07

When you don't produce enough insulin yourself, as diabetics do not, then you can use insulin as a drug.

如果你的体内不能产生足够的胰岛素,例如糖尿病人,你就可以将胰岛素作为药物使用

耶鲁公开课 - 生物医学工程探索课程节选

So if the firms wanted to make more money, the only thing they could do is they could sign an agreement saying, why don't each of us produce not our Cournot quantity, but produce half monopoly profits.

所以如果你们想多赚钱,唯一能做的就是签协议,我们不要按古诺产量生产了,各自生产垄断利润的一半多好呢

耶鲁公开课 - 博弈论课程节选

Do not eat fresh produce from the garden if it has come in contact with floodwater.

VOA: special.2010.07.19

Oftentimes, inventions that seem, in the abstract, to be good ideas may be impossible because something that you have to do to make it actually come into practice is too expensive and so it's not economic to produce the invention.

通常在理论上,创新固然不错,但却很难实现,因为把创意变成现实,花费会相当的昂贵,实现这样的创意非常不合算

耶鲁公开课 - 金融市场课程节选