They are very costly. Or you can buy a copy of a coin for much less money.

VOA: special.2010.03.22

If you want to control a program file, open, copy, paste not get me ready for my trip to Stanford.

如果想要掌控一项程序文件，打开，复制粘贴，并不会铺平通向斯坦福的路。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

One solution for that is to get a copy of a textbook I wrote called Basic Training in Mathematics.

解决办法之一,就是买一本我编写的教材,书名叫《数学基础训练》

耶鲁公开课 - 基础物理课程节选

The pilot spent fifty hours in a simulator -- a copy of the plane on the ground -- preparing for his ten-minute flight.

VOA: special.2010.07.07

You should be able to maybe print out a blank copy of those notes from the website not for memorizing them, but now just understanding how the photoelectric effect works.

你们应该可以从网站上打印一份,这些笔记中的空白的纸张,不仅仅是为了记忆，而且现在要理解,光电效应是如何工作的。

麻省理工公开课 - 化学原理课程节选

For example, the first genetic copy of a sheep had shortened telomeres.

VOA: special.2009.12.08

copy1 So this is the code that we had a moment ago for copy one.

这是我们之前的那个代码。

哈佛公开课 - 计算机科学课程节选

Employers seeking workers usually ask for a copy of a resume.

VOA: special.2011.06.10

When you copy a dictionary, for example.

比方说当你复制一个代码词典的时候。

麻省理工公开课 - 计算机科学及编程导论课程节选

The U.S. Federal Reserve System was really a copy of the Bank of England thinking that, well, the Bank of England managed to prevent bank runs for all these years, let's create the Fed, which we'll talk about again later.

美国联邦储备制度,就是模仿英格兰银行而建立的,试想一下,由于英格兰银行在预防,银行挤兑方面一直都很成功,所以美国就效仿建立联邦储备,后面的课程再讲美联储

耶鲁公开课 - 金融市场课程节选

When you think about a gene or a transcript, the messenger RNA copy of a gene, you know that for every sequence of a nucleic acid there's a complimentary sequence.

当你们考虑一段基因或者一个,转录一段基因的mRNA拷贝,你们知道每个核酸序列,都有互补序列

耶鲁公开课 - 生物医学工程探索课程节选

Well, I don't have to use that name for every copy of X, and as we'll see in a moment.

好的，我并不需要每次使用那个X的名字，我们一会儿将看到。

哈佛公开课 - 计算机科学课程节选