但有个问题，金星凌日很难得。
但有个问题：怎样才算是个完美的、持续的、高效的、环境优美的和最理想的城市呢？
The question is: what are the characteristics of an ideal, sustainable, efficient, environmentally-friendly, optimal city?
但有一个问题：和水星凌日不同的是，金星凌日是罕见的，大约每隔一百年会成对出现八年的时间。
But there was a problem: transits of Venus, unlike those of Mercury, are rare, occurring in pairs roughly eight years apart every hundred or so years.
减毒活疫苗被认为是最有效的，但有一个问题：一旦这些病毒苏醒，会发生什么？
The live-attenuated vaccine is considered the most effective, but there is a worry: what might happen once these viruses wake up?
我不喜欢他关于欧洲，社会政策或像同性恋权利等一些问题上的立场，但有两点让我乐意和他交往：一是他是个圈外人，二是他有胆魄。
I did not share or like his attitudes on Europe, social policy or on issues like gay rights, but there were two points of connection: he was an outsider and he had balls.
对于评估而言，更大的一个问题是，它们会导致人们胡说八道，这与学校成绩单一样，但有过之而无不及。
An even bigger problem with appraisals is the way they lead to fudge, just as school reports do but more so.
有时候这是一个优势，但有时候这也是一个问题。
Sometimes this is an advantage, and sometimes it's a problem.
虽然每个人都在谈论关于云的迁移，但有一个问题很少被提出，那就是哪些具体类型的云适合一个给定的公司。
Although everyone talks about moving to the cloud, a question rarely is brought up on which specific cloud type is more appropriate for a given company.
但有一个问题：尝试运行下面的代码，它对某些单元格有效。
But there is a catch: Try running the code below, and it works for some of the cells.
但有一个风险是，如果一个零部件存在缺陷，出现问题的可能就不是一种产品，而是多个产品线。
One risk, however, is that a faulty part could cause problems not on just one product but across many product lines.
但有多少消费者以及芯片公司能从中得益还是个问题。
But how much consumers — and the chip companies — will benefit is in question.
这是个冒险的选择但有时很必要——特别是如果其他大多数人都和约翰有问题。
This is a risky option but sometimes it is necessary – especially if most other people share the same problems with John.
但有一个问题，我委婉地问道，德国人接纳冷战期间被孤立和日渐贫困的同胞是美梦成真，不管付出的代价有多么沉重。
But doesn't that, I said politely, rather beg the question: Germany integrating their brethren, who'd been isolated and impoverished during the cold war, was a dream come true, whatever the cost.
他们提出了一个简单但有说服力的问题：做一份工作的员工，怎么能拿几份薪水？
They put forth a simple and compelling question: Why should any employee be paid more than once for the same job?
但有一个问题威胁着我们幸福的婚姻生活。
There is, however, one issue that threatens the blissful fabric of our marriage.
我曾撰文谈到过一系列与学习有关的习惯，但有一个方面是从来没有涉及到的，这就是集中注意力的问题，个中原因可能是本人觉得这是最难于养成的习惯之一吧。
I've written about a range of habits related to learning, but one I have not yet covered is concentration - perhaps because I find it among the hardest of habits to truly master.
但有一个问题：全球化没有保证公平或平衡分配利益的规则。
But here is the problem: globalization has no rules that guarantee the fair or balanced distribution of benefits.
管理人员可能能够回答出资人所提的三个问题，并且有可能因此而获得某个项目，但有时却不见得能够谈成这笔交易。
A manager might be able to answer the three sponsor questions and get rewarded with a project, but sometimes that won't close the deal.
但有两个问题随之出现：网路广告的价格，以及点击率。
Two problems have emerged with that model: the price of online ads and click-through rates.
但有个很大的问题，你得说服德国。
这是个好问题，但有时候即使选对了API，也仍然需要进一步处理数据。
That's a good question — but sometimes, despite a good API choice, you will have to massage the data some.
但有一个问题。
这个收入还不错，她说，但有一个问题：警察。
The money's good, she says, but there's just one problem: the cops.
这个场景非常新奇刺激，但有个小问题，声波是不能在真空中传播的。
It makes for a very cool and exciting scene, except for one small problem: Sound waves can't travel in a vacuum.
在我们的印象中，它们每时每刻都是一样的体积，但有一个问题我们忽略了，地球在不断的转动，实际上相对我们静止的东西，在不断的穿越着空间！包括我们自己。
But one detail seems to have been omitted: because of the revoluting earth, the seemingly still objects are constantly travelling through space, including ourselves.
但有一个问题，即e - mail采用什么样的结构：在邮件体还是附件中发送XML交易？
One issue, though, is how to structure the E-mail: Do you send the XML transaction in the body of the mail or in an attachment?
LMGTFY是个非常自负但有趣的网站，专为那些痛恨“我觉得打搅你来问这个问题比自己去Google上搜索方便多了”的人设计。
LMGTFY is a super smug and hilarious site built for those sick of “all those people that find it more convenient to bother you with their question rather than google it for themselves.
这种方法基本上可以工作，但有两个问题。
这种方法基本上可以工作，但有两个问题。
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