But once passed, it is gone forever.
而时间一旦度过，便永远地一去不返。
But fears that once handled in a supermarket the bacteria can be passed on through trolley handles, shopping bags and transfered to other foods.
不过他们担心一旦进入超市出售，这些细菌就会通过购物车手柄、购物袋传播至其他食品。
Many hours have passed and my only company was "just a dog," but I did not once feel slighted.
在仅有“区区一只狗”陪伴的数小时里，我从未感到过被忽视。
Many hours have passed and my only company was "just a dog, " but I did not once feel slighted.
在仅有“区区一只狗”陪伴的数小时里，我从未感到过被忽视。
Major stress like surgery or cancer could result in hair loss, but this is usually temporary and the hair will likely regrow without treatment once the stress has passed.
像手术和癌症的重压可以导致脱发，但是这只不过是暂时的，你的头发在这种治疗上的压力过去后又可以重新长出来。
He had once thought to gouge it out, but that had been a long time ago, and as time passed in the silence of the Waste, he had forgotten.
他曾经想过把这个标志挖去，但那是很久以前的事了。在寂静的荒野地，随着时间的流逝，他逐渐忘记了。
He had passed and re-passed his Island of Monte Cristo twenty times, but not once had he found an opportunity of landing there.
他一次又一次的经过他的基督山小岛，一共经过了二十多次，但始终没能找到一个机会上去。
The results showed memory performance dipped markedly once they had passed through a doorway, rather than when they covered the same distance but remained in the same room.
研究结果显示，一旦参与者通过一扇门后，他们的记忆力表现会明显下降。而只要他们还保持在同一个房间内，就算是同样的行走距离，他们的记忆力表现都会更好。
Several times he had been in Moscow, and in travelling had passed not far from Otradnoe, but he had not once been at the Rostovs'.
他有几次从离奥特拉德诺耶不远的地方经过，回到莫斯科，但是一回也没有到罗斯托夫家里去。
Lists allow the same socket to appear more than once in each list, but doing so doesn't make sense: conceptually, what is passed are sets of sockets.
列表中可以允许同一个socket多次出现，但是这样做一点意义都没有：从概念上讲，传入的应该是由socket组成的set。
Many years passed, every time when I think of it, I will be ashamed of myself, I lost the important thing once, but I will not lose it again.
多年过去了，每次我想到这件事，我就会为自己感到羞愧，我曾经失去了重要的东西，但是我再也不会弄丢了。
But once Janzen, who breeds wasps for his research on caterpillar-parasite symbioses, started to look, colors could be seen by the naked eye as wings passed over insects' black bodies.
一次，Janzen正在为他的昆虫共生实验培育蜜蜂，而当昆虫的翅膀越过黑色幼体的时候，他突然发现了肉眼可见的色彩。
Once the cancellation deadline has passed, you will not receive a refund, but you may send a substitute in your place.
如果过了退费的截至日期，我们将不办理退费，但是你可以选择派一个其他人代替来学习。
There was once a farmer who lived near a road. It was not a busy road, but from time to time, cars passed the farm.
从前，有个农夫住在马路边上。这不是个繁忙的路段，偶尔有汽车从农场路过。
In most animals, a serious threat causes a fight-or-flight reaction, but once the danger has passed, the brain circuitry stops flaring and they return to a state of rest.
对于大多数动物而言，一个严重威胁会引发一场战斗或逃跑反应，但是一旦危险过去，大脑就会停止发出威胁信号，他们也就返回到休息状态。
But time is special in a sense that it can not be recaptured once it has passed.
然而，从时间一旦逝去就无法重新再来一次的角度而言时间的确是很特殊的。
Thousands of years passed, the cairn of the dead was opened, and that splinter was found in the bone of the once mighty arm which the axe had all but hewn away.
几千年过去了，人们发现并打开了这个石冢，在里面的骨骼身上发现了当初那把斧头上缺掉的那个碎片。
A bird learns to sing and to fly rapidly at the right time, but the process is slow and hard once the critical stage has passed.
小鸟在合适的时候能够很快地学会唱歌和飞翔，但一旦关键期错过了，那么学起来就会既慢又难。
For example, ultra-poor English I test once passed four, skipping school dormitory only pick 40 people, but also picked to my... so, I will accept all of life to me, good or bad, I have too seriously!
譬如，英语超差的我，考一次就过了4级，搬宿舍全校只挑40人，还能挑到我……所以，我还是会接受生活给我的一切，好，不好，我都认真的过！
But they never stopped at the quarry. They passed on, up the summit. They plunged into the narrow path between the tall sumach bushes, and were at once hidden in the gloom.
可那两个人却经过老石坑，爬上了山顶他们一头钻进了茂密的漆树之间的一条小路，一下子就消失在黑暗中。
Since my personal negligence has brought about front the once has applied to not have passed, but application of daughter son-in-law but to o.
由于我个人的疏忽造成了前一次申请未予以通过，而女儿女婿的申请却得到了批准。
Since my personal negligence has brought about front the once has applied to not have passed, but application of daughter son-in-law but to o.
由于我个人的疏忽造成了前一次申请未予以通过，而女儿女婿的申请却得到了批准。
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