20元用英文怎么说

20元在英语中叫做"20 yuan"，来源于中文人民币的读法。

例句：

"The cost of this shirt is 20 yuan." (这件衬衫的价格是20元。)
"I will give you 20 yuan for this book." (我会给你20元买这本书。)
"She only had 20 yuan left in her wallet." (她钱包里只剩下20元了。)