Theory is splendid but until put into practice, it is valueless.
理论是伟大的，但在付诸实践之前，它是没有价值的。
-- J. C. Penney J.C.彭尼
Theory is splendid but until put into practice, it is valueless.
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Theory is splendid but until put into practice, it is valueless.
理论是伟大的，但在付诸实践之前，它是没有价值的。
-- J. C. Penney J.C.彭尼
