教育专家的这种普遍共识无可争辩地证明了一个不可改变的学习原则：主动性和正确的方法是学术上成功的基础。
This universal consistency among education experts indisputably demonstrates an immutable principle of learning: initiative and correct methods are fundamental to academic success.
进化中不可逆性的观点得到了证明，并被称为“多洛法则”。
The idea of irreversibility in evolution stuck and came to be known as "Dollo's law".
令人担忧的是：普京执掌俄罗斯期间，已经向世人证明了其作为供应国的不可靠性，只要惹恼了克林姆林宫，燃气供应就会被切断，正像其对待乌克兰和白俄罗斯一样。
That is a worry: under Vladimir Putin Russia has proved itself an unreliable supplier, cutting gas to countries such as Ukraine and Belarus that have incurred the ire of the Kremlin.
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