来自《耶鲁大学开放课程：基础物理 第7集 第7集》
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Just imagine that you wrote this equation想想你写下了这些式子 -
but you couldn't solve it.却解不出它 -
What you would be saying would actually be correct.你所说的事实上完全是正确的 -
You, in fact, have found the correct law of gravity其实你发现了正确的引力定律 -
but you can never be sure it's right但你却不能肯定这是正确的 -
because you cannot find the consequence of your equation.因为你不能找到这个等式的解 -
That is not unheard of.这不是什么稀罕的事 -
That's happening in physics today.当今的物理界屡见不鲜 -
For example, there's the Theory of Quarks.比方说 夸克理论 -
The quarks are attracted to each other根据某种我们所知的力学原理 -
by a certain mechanism we know.夸克会相互吸引 -
We know the underlying force law我们知道其背后的作用力原理