考试作弊并不经常发生，但一旦发生，学校会采取严厉的态度。
Cheating at exams does not occur very often. But when it does, the school takes a very tough position.
考试作弊并不经常发生，但一旦发生，学校会采取严厉的态度。
Cheating on exams does not occur very often. But when it does, the school takes a very tough position.
车辆同样也能通过积雪，但一旦发生即使是极轻微的打滑，也会使车辆就开始沉陷。
Cars too can go over the snow but it takes a slightest slip for them to start sinking.
RFA后的剧烈疼痛是罕见的，但一旦发生可能会持续数天，需要麻醉剂来缓解痛苦。
Severe pain after RFA is uncommon, but may last a few days and require a narcotic to provide relief.
但有的研究者警告说，虽然病原体逃逸的危险很小，但一旦发生，后果将是灾难性的。
But some researchers warn that while the risk of the pathogen escaping is small, the consequences could be catastrophic.
虽然隧道火灾的发生概率极小，但一旦发生，其将带来严重的危害以及巨大的经济损失。
Although the probability of a tunnel fire is very small, once it happens, it can lead to serious harm and huge economic losses.
虽然电控发动机故障率低，但一旦发生故障，不仅影响发动机的性能，而且故障诊断困难。
Although the fault rate of electronic control engine is low, and once it breaks down, which not only affects the engine's performance, but also difficult to diagnose.
外包行业表示，“不鼓励也不阻止”办公室恋情，但一旦发生办公室恋情，会采取容忍的态度。
The outsourcing industry says it does not "encourage or discourage" office romances but tolerates them when they develop.
“这样的地震几百年里可能都很少见，”Applegate博士说，“但一旦发生，那就是灾难性的”。
"They only happen every few hundred years, perhaps," Dr. Applegate said, "but when they do happen, the results are catastrophic."
西雅图……西雅图不常发生大规模地震，但一旦发生，西雅图与邻近的太平洋沿岸西北部城市的地震应变能力，都不及旧金山。
Seattle, big ones don't hit Seattle very often, but if one does, neither it nor any of the nearby Pacific Northwest cities is as well prepared as, say, San Francisco.
它可能看起来像一辆普通的黄色巴士，但一旦你进去，所有的奇迹就会发生。
It may look like a normal yellow bus, but all the magic happens once you get inside.
在这种情况下，一旦在某一断层发生地震，震完也就结束了，但这也意味着，该区域其它现在似乎沉寂的断层仍可能被触发。
Under these conditions, once an earthquake occurs on a given fault, it's done; but this also means that other faults in the region that appear quiet today may still be triggered.
这似乎是最可期待的，但一旦哈马斯从受到的打击中恢复过来，对于以色列南部的火箭袭击又将复发，就像过去发生的那样，确定无疑。
That seems to be the most that can be hoped for, though a renewal of rocket attacks on southern Israel, once Hamas recovers, is as certain as day follows night.
但一旦产生正向现金流，情况就可能发生改变。
But once it generates positive cash flow, the story can change.
这样的事件几百年才发生一次，也许是这样，但当他们一旦发生，后果是灾难性的。
They only happen every few hundred years, perhaps, but when they do happen the results are catastrophic.
一旦得了禽流感，他们养的飞禽就有可能抑制住它……但如果你养的是单一的那一种，一旦发生某一种疾病，就会灭绝了。
If avian influenza comes along, they can have the bird that's resistant to it... you won't have a monoculture, when one disease hits it, and it wipes it out.
但这一切一旦发生，欧洲的金融机构将有可能遭受最为痛苦的折磨。
And when that does happen it is very likely that the financial institutions of Europe will suffer most.
金属催化剂是高活性的，但一旦它们发生了反应就很难分离出去，留下微小的杂质可能影响芯片的性能。
Metallic catalysts are highly active, but they're difficult to remove once the reaction is done, leaving small impurities that can nonetheless interfere with a chip's performance.
但一旦证券市场发生大跌，承保人可能会赔掉先前所有的收益。
But when the market falls, the insurer may have to pay out all his previous gains.
无法预见发生的时间，但一旦大流行病毒出现，迅速的国际传播是肯定无疑的。
The timing cannot be predicted, but rapid international spread is certain once the pandemic virus appears.
我没法时时刻刻地关注她的事情，但一旦她行为上有任何变化，我会留心是否发生什么事导致她如此。
I do NOT HAVE TIME to be looking at her stuff, but that if there is a behavior change in her I WILL look to see if there is anything going on that is causing it.
但金融记者贾斯廷·福克斯研究了他们的历史，发现一旦破裂，会发生什么。
But financial journalist Justin Fox has studied their history and discovered what happens when they burst.
这并非是你看到了与别人不同的事物才得出的怪论，我不希望这样的事也发生在别人身上，但你一旦体验到了，也是很值得的。
It's not that you see things that other people don't, you just have this 7 weird knowledge that I don't wish upon anybody, but if you have to get it, it's very worthwhile.
但一旦你在别人面前流泪，周围环境会发生变化，尤其是在商务中。
But once you cry in front of others, the environment will change, particularly in a business.
当然我们有时也有争执，但就象在你们足球队那样，一旦发生矛盾我们就想出调整和解决的方法。
We disagree sometimes, of course, but just as your football teams, when there are conflicts we work out adjustments and accommodations.
但这种情况一旦发生，每天喝一杯酒的研究对象与那些不喝酒的相比，患痴呆症的几率降低了85。
However, once mild impairment occurred, subjects who had up to one drink per day of alcohol had an 85 percent reduced risk of dementia compared with those who abstained.
艾伦·巴杰一直很确定他的信念，但一旦那与真正的自己发生冲突，他会选择接受真实身份的不确定性。
Allan Barger tried living the certainties of his faith, but when that conflicted with who he really was, he chose to embrace the uncertainty that came with his true identity.
细胞有不断修复这些破坏的机制，但一旦修复机制被破坏，染色体就变得不稳定，癌疹就有可能发生。
Cells have repair mechanisms that constantly fix this damage, but when the repair process breaks down, chromosomes become unstable and cancers are more likely to develop.
但什么是一旦发生子进程处理客户请求，它一直在听，但不迎合这个客户端。
But whats happening is that once the child process has processed the clients requests, it keeps on listening, but does not cater to this client.
显然，外伤比如膝盖受伤这样的情况一旦发生，会很糟糕，但同时也要考虑到偶然性、坏运气和一些不便。
Certainly it's too bad because traumatic injuries like those to the knee can happen, but then there's also chance, bad luck and some inconvenience.
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