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In other words, it is always worth learning about best practices (even old ones), because hiding within each is a general principle that will help you meet a specific set of requirements.

换言之，学习有关最佳实践的知识(即使是旧知识)总是值得的，因为每种方法的背后都隐含一条通用原则，这有助于您满足特定的需求。

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A corollary of this principle is that a learning algorithm should never be evaluated for its results in the training set because this shows no evidence of an ability to generalize to unseen instances.

这个原理的一个推论是，一种学习算法永远不会对它训练集的结果进行评估，因为对于一种未知的事例而言，没有证据表明算法具有概括它们的能力。

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The e-learning programme is founded on the basic and practical principle that the use of the internet as a learning tool not only creates anonymity and thus dismantles the psychological barriers that prevent illiterate adults from resuming their studies but also enables them to balance their work, family and learning commitments by learning at home at whatever time is suitable to them.

UNESCO: Ich will lernen (I want to learn)

The important thing is learning whether in principle a more stable mode of optical quantum communications are possible.

FORBES: The Air Force Is Working On A Holographic Quantum Computer