The dollar sign looks like this $. 元的符号像$。

　　It is the official currency in some countries, such as the United States, Canada, Singapore, Australia, New Zealand and so on. 元是美国、加拿大、新加坡、澳大利亚、新西兰等国的官方货币。

　　If you say "dollar", most of the time you mean the United States dollar. 人们提到元，很多时候指的是美元。

　　It is the most popular in the world. 美元是世界上流通最广的货币。

　　The United States chose the dollar as its currency in 1792. 美国于1792年选择美元作为它的货币。