Aristotle once pointed out in his Poetics that metaphor is the mark of genius.

亚里士多德在他的《诗学》里说过，比喻是天才的标志。

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Fei Xiaotong, a famous sociologist, once pointed out, "People have found a relatively effective (effect can only be relative) upbringing mode throughout the past history, that is by parents."

著名社会学家费孝通曾指出：“在过去的历史中，人们似乎找到一个比较最有效(效力总是相对的)的抚育方式，那就是双亲抚育。”

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One of Friedrich Hayek's obvious-once-pointed-out observations is that society is full of local knowledge, often of a subtle nature and only fleetingly exploitable.

弗里德里希·哈耶克(Friedrich Hayek)曾经指出的一个显而易见的观察就是，社会充满了局部知识，这些知识常常具有微妙特性，以及仅仅是瞬时的可利用性。

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he adds,we must be vigilant. Khamenei also pointed an accusatory finger, once again,at the Western press, as he has done repeatedly in recent weeks, saying Western "enemies" of Iran are using "their media to instruct agitators who are provoking chaos, destruction and violence."

VOA: standard.2009.07.20

You can keep a constitution in your pocket, as Thomas Paine once pointed out.

NEWYORKER: The Commandments

Once pointed out it's relatively easy.

BBC: The heartbreak of watching the slow death of ash trees

But the session once again pointed up the pressure imbalance generated by the referendum.

BBC: The currency of debate at First Minister's Questions