But because every farmer's field is different, figuring out exactly how much to use is complicated.

VOA: standard.2010.07.28

And those who argue it's not possible and use science to argue for that, very often,are hurting more than helping the field.

而那些认为这不可能的人,他们用科学来争论，很多时候，只有阻碍作用而毫无帮助。

哈佛公开课 - 幸福课课程节选

So, ask yourself frankly especially when it comes to designing your own tools and your own programs whether it's for real users to use, whether it's for your research group to use in some other field, you know, where do you even begin?

坦白讲，问一问你们自己,当你设计一个工具，一个程序时,它是否是为真实用户使用的，还是为在其他领域的,研究团队使用的，你们懂的，你从哪里开始？

哈佛公开课 - 计算机科学课程节选