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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Senior editor of Oxford English Dictionary Robert once pointed out that "Withuot Euphemism, language isn't a perfect communication tool any more".

牛津英语字典的资深编辑罗伯特布切菲尔德也曾指出“没有委婉语的语言就不是完美的交流工具。”

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I feel the more inclined to emphasise this caution because I once had a rather embarrassing and pointed proof of its desirability, -- which I relate for the enlightening of the reader.

我觉得特别有必要把以上这一点强调一下，这是因为我曾经有过一次很尴尬的经历。 这次经历也非常深刻地证明了刚才我跟大家谈到的这一点。

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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