Theory is of great importance but there's no substitute for practical experience.

理论知识是很重要，但是没有任何东西能代替实践经验。

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The fourth-generation theory divides things into four categories-ABCD-according to their urgency and importance.

第四代理论把事情按紧急和重要程度分为 ABCD 四类。

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Alcott had this to say about the importance of verbal communication: "My theory of Conversation as the natural organ of communicating, mind with mind, appears more and more beautiful to me."

阿尔科特以此表达了语言交流的重要性：“我的认为会话是思想与思想交流的天然途径的理论在我看来越来越有魅力。”

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Before we got into the actual exercises to learn this concept, the delegates spent some time fleshing out the context and importance of a systemic theory of change.

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They understand, in theory, the importance of social media in their marketing mix.

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The Higgs boson is of huge importance to the widely accepted theory of physics, known as the Standard Model.

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