伟大的理论来自伟大的实践，同时对实践具有指导作用。
Great theory comes from great practice and plays an important role in guiding practice.
伟大的时代呼唤伟大的理论，伟大的理论来自伟大的实践。
A great era calls for a great theory, and a great theory comes from great practice.
爱因斯坦也说过，每一个伟大的理论后面有一个简单的物理图像，即使是外行人也能理解。
Einstein also said that behind every great theory there is a simple physical picture that even lay people can understand.
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