最近我在你们公司买了一把办公椅，但是我在大约一个星期前把它退了。
I recently bought an office chair from your company, but I returned it about a week ago.
但是位于鲁卜哈利的湖在数千年前就已消失殆尽。
But the Empty Quarter lakes disappeared thousands of years ago.
第二种选择是走到书架前，但是这次，把书拿开，然后稍微多拿一会儿，再把书放到顾客手中。
The second option also involved going over to the shelf but, this time, removing the book and then subtly holding onto it for just an extra moment before placing it in the customer's hands.
最早的陶瓷制品是在制陶的温度下烧制的，但是早在公元前15世纪，（人们）已经用高温烧制表面上釉的炻器。
The earliest ceramics were fired to earthenware temperatures, but as early as the fifteenth century B.C., high-temperature stonewares were being made with glazed surfaces.
十年前，光滑的塑料雪橇开始流行起来；它们比木制雪橇跑得快，但是很难操控，也很慢。
Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.
但是，不管其确切的日期是在15000年、20000年还是30000年前，肖韦洞窟都属于艺术的开端。
But be that as it may, whatever the exact date, whether it's 15,000, 20,000 or 30,000 years ago, the Chauvet paintings are from the dawn of art.
尽管我不久前才转学到这所学校，但是我现在已经融入班级了，因为我的同学们都非常好。
Though I transferred to this school not long ago, I have fitted into the class because my classmates were very nice.
但是我曾乘坐冰川快车去瑞士旅行，大约8年前我坐火车穿越了中国。
But I've traveled on the Glacier Express to Switzerland, and I traveled across China by train about 8 years ago.
虽然不像膝盖或脚踝扭伤那么常见，但是前十字交叉韧带撕裂会让运动员停赛最长一年之久。
While nowhere near as common as knee or ankle sprains, torn ACLs put players out of the game for up to a year.
可以，但是你必须在10点前回来。
当然可以，但是你必须在学期结束前归还。
没有人知道确切的数字，但是根据政府的调查，粗略计算之后显示，大约有1600所美国公立和私立学校在教授中文，而十年前只有300所左右。
No one keeps an exact count, but rough calculations based on the government's survey suggest that perhaps 1,600 American public and private schools are teaching Chinese, up from 300 or so a decade ago.
现在，我没有告诉你这件事但是，他几天前给我打电话询问关于功课的问题。
Now I didn't tell you this but he called me the other day about homework.
等待令人沮丧，但是在时机没有成熟前就去冒险会使我们很快遭到没顶之灾。
The wait has been frustrating, but to venture forth prematurely would have us venturing back to base very speedily.
但是在三十前的春天早些时候，圣海伦火山开始隆隆作响。
But in the early spring three decades ago, Mount St. Helens began to rumble.
但是这个团队在获得真正的增强视觉前还面临着许多挑战。
But the group faces a number of challenges before achieving true augmented eye vision.
但是研究人员还未确定他们的心脏在训练前是否已经异于常人。
But researchers have not yet determined whether the athletes' hearts were larger to begin with.
葡萄酒装瓶前，会使用蛋清澄清，但是不经过过滤。
Today the wines are fined with egg whites but not filtered before bottling.
增长能源在BP灾难前就计划了这次商业活动，但是这次推广恰逢其时。
Growth Energy planned the campaign before the BP disaster, but the push could hardly be better timed.
但是，就在数天前，接着为了参加8国峰会而去了法国，他又去奉承别人了。
But that was days ago. Next came France, for the G8 summit, and he had other people to butter up.
但是，在这个月结束前，我们应该对我们的机会了解更多。
But we should know a great deal more about our chances before the month is out.
但是这些肉必须煮熟，在你吃前必须杀死所有有害病原体。
But the meat must be cooked, which will kill any noxious pathogens before you eat it.
但是，前橙色联盟之间的争吵以及这场金融危机帮了他的忙。
But squabbling among former orange Allies and the financial crisis did him favours.
事件要排队；但是，当普通代理在处理事件前断开时，事件就会丢失。
Events were queued up; however, when the General Agents disconnected before events were processed, the events were lost.
在我考完试前，我本想当面来谢谢你的，但是你已经走了。
I wanted to thank you in person but you'd already left before I finished my finals.
前9次跑步练习会有些困难，但是之后，那会变得更棒也更有趣。
The first 9 running workouts can be difficult, but after that, it almost always gets better and more enjoyable.
但是一些前记者有时表达的是超负荷的感觉。
But some former reporters described feeling overtaxed at times.
但是，在向文档中输入文本前，需要考虑光标的位置。
Before you begin typing text into the document, however, you need to think about where the cursor is.
但是，在向文档中输入文本前，需要考虑光标的位置。
Before you begin typing text into the document, however, you need to think about where the cursor is.
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