BBC news 2010-09-25 加文本

1.The first topic is likely to be a fuel-swap deal negotiated a year ago, under which Iran would ship out stocks of enriched uranium in return for fuel for Tehran research reactor.

under which

介词+关系代词”(关系代词一般指的是which/whom)引导的定语从句，有以下几种情况:
　　1.“介词+which”在定语从句中作时间，地点，原因状语，相当于关系副词。如:
　　(1)This is the reason for which(=why) he left the company.
　　这就是他离开公司的原因。
　　(2)He will never forget the day on which (=when) he went there.
　　他永远忘不了去那儿的那一天。
　　(3)Is this company the one in which (=where) you worked half a year ago?这就是半年前你在那儿工作的公司吗?
　　2.“介词+which/whom”在定语从句中作目的，方式状语。如:
　　(1)Can you tell me for whom you are working?
　　 你能告诉我你现在为谁工作吗?
　　(2)There is a big hole on the wall through which he can see what’s happening inside.
　　 墙上有一个大洞，通过这个洞他能看到里面所发生的一切。
　　(3)The train by which he is travelling is arriving.
　　 他乘坐的那辆火车就要到了。
　　(4)In the dark street， there wasn’t a single person to whom she could turn for help.在漆黑的街上，没有一个人她可以求助。
　　3.“不定代词，数词或名词+of which/whom”在定语从句中充当主语。如:
　　(1)There are sixty students in our class， all of whom are working hard.
　　 班上有60 名学生，他们都在努力学习。
　　(2)He paid the boy ten yuan for cleaning the windows， most of
　　 which hadn’t been cleaned for at least a year.
　　 他给了那个男孩十元钱擦那些至少一年未擦的窗户。
　　4.“形容词最高级+介词+关系代词”在定语从句中充当主语。如:
　　(1)There are sixty students in the class， the tallest of whom is Li Ming. 班上有六十名学生，其中最高的是李明。
　　(2)There are seven continents in the world， the largest of which is
　　 Asia. 全球有七大洲，最大的是亚洲。
　　5.“the+n.+of+which”引导的定语从句，相当于whose引导的定语从句。如:
　　(1)We took a photo of a rocket， the length of which was about 30
　　 meters.=We took a photo of a rocket， whose length was about 30
　　 meters. 我们给火箭拍了照，火箭大约长30米。
　　(2)Recently I bought an ancient Chinese vase， the price of which
　　 was very reasonable.=Recently I bought an ancient Chinese vase，
　　 whose price was very reasonable.
　　 最近我买了一个中国古代花瓶，价格非常合理。
　　6.“介词+whose”修饰后面的名词。如:
　　He is the very man in whose pocket I found my lost money.
　　他就是那个我在他的口袋里找出我丢掉的钱的人。
　　7.“介词+which+不定式”此结构相当于一个简化了的定语从句。如:
　　(1)He found something about which to write(=he could write).
　　 他发现有些事是可以写的。
　　(2)The poor man has no house in which to live.=The poor man has no house in which he can live. 这个穷人没有房子住。