Zhè jiā gōngsī shàngshì yǐhòu, chuàngshǐrén chéng le yìwàn fùwēng.
After the company went public, its founder became a billionaire.
Tips
usage
亿 is a hundred million, so 亿万 literally means 'hundreds of millions' but is used loosely for 'billions'. A millionaire is a 百万富翁; a rich tycoon in general is a 富豪.
