他们提出，一但南非组织者组织失败，将由澳大利亚来代替。
They mooted Australia as an alternative should South Africa's organisers fail to get their act together.
学习一个概念绝不容易，但一但你真正理解了它，知识便可以重复利用。
It's hard to learn a concept, but once you understand it, that knowledge can be applied repeatedly.
这同样也适合占世界产出几乎三分之一但只有17%投票权的美国。
It also suits America, which accounts for almost a third of world output, but casts only 17% of the votes.
美国人有更多机会接受癌症的筛查，一但被诊断患有癌症，他们的五年存活律更高。
Americans are more likely to be screened for cancer, and once cancer is detected, they are more likely to survive for five years.
“孩子的确似乎能增加家庭的幸福，人们也是这样期望的，但一但生了孩子，麻烦就来了，”他在大会上说。
"Children do seem to increase happiness [while] you're expecting them, but as soon as you have them, trouble sets in," he told the conference.
最后，也是最重要的一点，尽管你和你的朋友在某些方面意见不一，但让你的朋友知道你很珍惜彼此的友谊。
Lastly and most importantly, show your friends that you value your friendship even if you disagree about something.
红色肉类是最大、最臭名昭著的排放源之一，但一月份从加利福尼亚州向明尼苏达州运送沙拉也带来了相当重的负担。
Red meats are among the biggest and most notorious emitters, but trucking a salad from California to Minnesota in January also carries a significant burden.
当然，侵蚀是造成其破坏的主要原因之一，但人类活动应承担的责任也越来越大。
Erosion, of course, is one of the key reasons for its destruction, but human activity is also increasingly responsible.
它是牛津最小的学院之一，但拥有最好的图书馆。
It is one of the smallest colleges in Oxford but with the best library.
手机是过去50年里最有用的发明之一，但并不是所有关于它们的说法都是正面的。
Mobile phones are one of the most useful inventions of the last 50 years, but not everything that is said about them is good.
仔细思考后，我意识到自己的队伍可能不是乔治亚州的第一，但整个队伍都指望着我。
Thinking hard about it, I came to realize that my team might not be the number one team in Georgia, but they were depending on me.
虽然大多数致病突变在人类中发现的概率为千分之一到百万分之一，但基础突变发生的几率可能高得多。
While most disease-causing mutated are found in humans at a rate of one in a few thousand to one in a few million people, founder mutation can occur at much higher rates.
国家保健服务占所有公共消费的五分之一，但只有4%的资金来预防疾病而剩下的用于治疗。
The NHS accounts for a fifth of all public spending but uses just 4% of its funds to dodge disease rather than tackle it.
即使你不是“完成工作”小组的疯狂成员之一，但你也许会有计划表、日程表或有许多清单，上面列有许多要做的事情。
Even if you aren't exactly a member of the cult of Getting things Done, you probably have a schedule, calendar and a couple lists of things to do.
虽然基因的差异可能是影响婚姻的原因之一，但其它的研究表明大脑可以通过训练来抵制诱惑。
While there may be genetic differences that influence commitment, other studies suggest that the brain can be trained to resist temptation.
它们也是美国最受欢迎的宠物之一，但饲养得当颇为不易。
They are also among the most popular reptile pets in the United States, despite being quite difficult to care for properly.
大规模部署是选项之一，但很少有企业有文化会追求这种成功，因此它一般也是失败的。
Big-bang deployment is an option, but few organizations have the culture to pursue this successfully, and so it usually fails.
出汗是那些看似简单的生理机能之一，但生理学家仍然没有充分理解它，至少在为什么性别会影响出汗这个问题上。
Sweating is one of those bodily functions that seem uncomplicated, but it remains not fully understood by physiologists, at least in terms of how (and why) gender affects the process.
经济刺激是负债增长的因素之一，但非主要因素。
Stimulus is one, but not the major, contributor to the increased debt.
冰山是大自然最壮观的创造之一，但大多数人却从未看到过冰山，一种朦胧神秘的气氛笼罩着它们。
Icebergs are among nature's most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them.
他说，卡斯是其中之一，但，道格拉斯还希望有一位他的支持者进入内阁。
He said Cass could be one of them. But Douglas wanted one of his own supporters to be the other.
全世界每个分部的人员数目不一，但总的来看，我们是一支非常高效的全球性队伍。
The number of people working in each office varies, but together we have a very effective global team.
爱迪生发明了很多东西，实际上他是历史上最著名的发明家之一，但电灯泡不在他的方面之列。
Edison invented a lot of things – in fact he’s one of the most famous inventors of all time – but the light bulb wasn’t one of them.
虽然数据的分布是许多设计标准之一，但关注的业务问题重点是由业务构成的。
While data distribution is one of many design criteria, the primary focus should be on the business questions that will be posed by the business.
抗生素的质量也是原因之一，但就结核病而言，这一因素的作用到底多大尚不明了。
Quality of antibiotics also contributes, although in the case of tuberculosis the true extent of this is unknown.
尽管伊朗是世界最大产油国之一，但该国炼油厂年久失修，而且由于慷慨的补贴，汽油需求已到失控地步。
While Iran is one of the world's biggest oil producers its refineries are dilapidated and it suffers from runaway petrol demand because of generous subsidies.
尽管伊朗是世界最大产油国之一，但该国炼油厂年久失修，而且由于慷慨的补贴，汽油需求已到失控地步。
While Iran is one of the world's biggest oil producers its refineries are dilapidated and it suffers from runaway petrol demand because of generous subsidies.
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