Once it happened that a disciple came to a Zen master and asked, "Why are a few people so intelligent and a few so stupid?"

曾经，有个弟子前去问一位禅师，“为何有些人非常聪明，有些人却很蠢？

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People who loved once would understand that anything so-called everlasting is a fairy tail only. It is unlikely to have in true life, so it is much preciously once it happened.

曾经恋爱过的都明白，童话式的天长地久只属于童话，属于现实，难得，所以可贵，所以童话！

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It helps people remember what once happened such as dreams, friendships and happiness.

它帮助人们记住曾经发生过的事情，如梦想、友谊和幸福。

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For example, the stock market crash of 1929 is repeatedly re-expected even though it only happened once; it's just prominent in our thinking.

929年股市崩盘,就被反复提及,尽管这只发生过一次,但是人们对它影响深刻

耶鲁公开课 - 金融市场课程节选

It had alerted its citizens to keep out of Sinai and seems to have had military preparations in place to quickly deal with the border incursion once it happened.

BBC: Sinai attack marks step change in border violence

That has happened once, and it happened last year, and Speaker Boehner was Speaker of the House.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Whilst he said he was received well at that event he said once it had happened there "wasn't much engagement afterwards".

BBC: Unionists seek clarification on Sinn Fein Easter message