I shall take the simpleminded view that a theory is just a model of the universe, or a restricted part of it, and a set of rules that relate quantities3 in the model to observations that we makiae.

• 用简单的思维方式，可以说理论不过是关于宇宙的模式或关于它的某一有限部分的模式，以及一整套把这个模式中的量与我们观测的结果联系起来的规则。