李明珠的文章也显示了另一个由谷物价格引发的理论问题，即如何定义和界定市场。
Another theoretical problem raised by the grain price data, also illustrated in Li's article, is that of how to define and identify markets.
界定你的问题。随便一张纸，用你的手写手机，电脑也可以，只要能记下你的笔记就可以，详细而周密地定义你的问题，一旦你这么做了，你将发现很快会有解决方案。
Define your problem. Grab a sheet of paper, electronic notebook, computer or whatever you use to make notes, and define your problem in detail.
换言之，阳光的减弱依然是一个有待界定的问题，随着它的范围定义变得越来越清晰，我们对这个世界面临的挑战的性质也就会更明白了。
Solar dimming, in other words, is a problem still in the process of being defined, and as its dimensions become clearer, so will the nature of the challenge the world faces.
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