n. a very rich person whose material wealth is valued at more than a billion dollars
n. 亿万富翁
1. Many billionaires donate large sums of money to charity each year.
许多亿万富翁每年向慈善机构捐赠大量资金。
2. The billionaire started a new tech company that quickly became successful.
这位亿万富翁创办了一家新的科技公司，并迅速获得成功。
3. She dreams of becoming a billionaire one day and traveling the world.
她梦想有一天成为亿万富翁，环游世界。