This happened once when I was in the mall with my best friend, and met up with another friend.
有一次，我和最要好的朋友购物时，碰到另一个朋友，就发生了这种事情。
What happened to Australia's megafauna, the giant animals that once existed across this enormous continent?
曾经生活在澳大利亚这片广袤大陆上的巨型动物经历了什么？
If the doublecross happened only once, you might decide to continue the friendship, but let this guy know that his behavior is unacceptable.
如果出卖朋友行为只发生了一次，你可以决定继续友谊，但是要让这个家伙知道这种行为不能接受。
这种事情发生了不止一次。
“It’s only happened once before. It’s a confluence of circumstances that come together to cause this,” said John Rowden, citizen science director at the Audubon Society’s New York chapter.
对此，美国奥杜邦环保协会纽约分会公民科学处处长约翰.劳登表示“这种情况之前曾发生过一次，造成这种现象是由多种原因综合作用而成。
This happened in the PC industry: What were once features exclusive to premium products migrate slowly down to the lower-end of the market, and price becomes the paramount factor for consumers.
这种现象在PC行业已经发生过了：有些功能以前只属于某些高级产品，但它们渐渐会普及到低端市场上，这时价格就成了左右消费者选择的重要因素。
As these once - obese humans lost weight over the course of a year, their mix of gut microbes changed to reflect their new, svelte status. Why this happened is not clear.
在这一年中，这些曾经肥胖的人的体重逐渐减轻，他们的肠道微生物也发生了改变以反映其日渐苗条的身材。
And so it goes. I was once on an hour long meeting where this happened for the first 15 minutes, which made me late for the next meeting where I caused it to happen again.
就是这种状况，我曾经参加过一个持续了一小时的会议，前十五分钟一直都在处理类似的事情，这让我没能赶上参加下一个会议，而且因为迟到，我也导致了类似状况的发生。
We used to think of pressure as this random acute phenomenon that happened every once in a while.
约翰•汉姆表示：“我们以前认为，压力是随机出现的危急现象，只会偶尔发生。
This has happened only once before since the late 1950s-in March 2003, which proved to be the start of a long rally.
这在1950年代晚期以来还是首次发生——上一次发生在2003年3月，紧随其后的是一波长期牛市。
If you had slept with me just once, none of this would have happened.
如果你跟我上过床哪怕一次，任何事都不会发生了。
While they meet up once a month, this is the first time since mid March that this has happened while Pluto has been focused on the future.
尽管他们每个月都相遇一次，但这是自三月中旬以来冥王星第一次被集中在未来上。
Since a robbery happened in this building, the night watchman has become more careful and makes his rounds once every hour.
自从这座大厦发生了一起抢劫案之后，守夜人就更加小心了，他每小时都要巡视一次。
What happened to this once great country? What force (maybe ourselves is the only force?) was at play that turned this country to this state of pathetic existence?
这一伟大的国家发生什么事了？是什么力量使得这个国家变成如今悲惨的现状？
Once happened during the transformation from the important changes to all connected with this, the continuity of the steps are necessary.
一旦转换过程中发生的重要变化，从对所有与此相连，连续性的步骤是必要的。
You're doing this to keep morale up, to explain exactly what happened, and to remind your company, yet once again, that they should not be speaking to any media.
这么做的目的是保持士气，精确地解释发生的事件，并再次提醒员工不要跟任何媒体交流。
And, even if he had been subjected to our mind probes, what would that have told us? Probably what we knew already: that this happened just once.
况且如果真要是他被思维探测进行了研究，那又会告诉我们什么呢？大概我们已经知道了：那仅仅发生一次。
Indeed this might have happened only once in a hundred years.
事实上，这可能发生的唯一一次在一百多年。
A car accident happened on the high way this morning. Three men were killed, the wounded were taken away to hospital at once and policemen were sent there to cope with the event.
今天早晨高速公路上发生了一起车祸，三人丧生，伤员马上被送往了医院，并马上派了警察去处理这一事件。
By (reporter Zhang Lei) "Once again, we emphasize that this incident happened at medical institutions is an accident, not a hospital caused by the fault behavior."
本报讯(记者张蕾)“我们再次强调，这次事件就是发生在医疗机构的一个意外事件，不是医院的过错行为导致的。”
By (reporter Zhang Lei) "Once again, we emphasize that this incident happened at medical institutions is an accident, not a hospital caused by the fault behavior."
本报讯(记者张蕾)“我们再次强调，这次事件就是发生在医疗机构的一个意外事件，不是医院的过错行为导致的。”
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