VOA慢速英语:How Gold Became the Gold Standard for Trade

短语讲解：

1. In economics, the term describes how major trading nations once used gold to set currency values and exchange rates.

exchange rate 汇率
例句：The exchange rate today be 250 Japanese yen to the pound. 
今天的兑换率是1英镑换250日元。

2. In the United States, people could exchange paper money for gold from the eighteen seventies until nineteen thirty-three.

exchange for 用…换取…
例句：Where can I exchange my American money for foreign money?
我在哪儿可以把美元兑换成外币?

3. Some politicians from time to time call for a return to the gold standard.

from time to time 不时，偶尔，间或
例句：I can see him at the library from time to time.
我在图书馆有时能看见他。

4. The soft, dense metal polishes to a bright yellow shine and resists most chemical reactions.

chemical reaction 化学反应
例句：A chemical reaction is a process in which one species is converted to another. 
化学反应是一种物质转变成另一种物质的过程。 

5. It took place at the eighteen ninety-six Democratic National Convention in Chicago.

take place 发生，举行
例句：As usual, the yearly audit will take place in December. 
跟往常一样,年度审计将在十二月份进行。 

6. You shall not press down upon the brow of labor this crown of thorns.

press down upon/on紧压在…上；紧逼着(某人)
例句：I can see that his new responsibilities are pressing down on the young father.
我可以看出，新的责任紧压在这位年轻父亲的身上。