Everybody allows that to know any other science you must have first studied it, and that you can only claim to express a judgment upon it in virtue of such knowledge.
几乎所有人都承认，要知道其他科学，就必须要研究它，也只有在研究过之后，才有资格下判断。
"30 days and allows you to master psychology" is a popular science book about the psychology books.
《30天让你精通心理学》是一本有关心理学科普读物。
But a depth of knowledge in a specific discipline, like computer science or engineering, allows you to understand that business as well as run it.
但是，对某一学科——如计算机科学或工程学——的深入学习，能够让人理解某个特定行业，同时具备这个行业实际的经营能力。
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