亿万年

shí guāng guò le yì wàn nián

时光过了亿万年。

Aeons passed.

shēng wù xì tǒng yì wàn nián lái yī zhí dōu shì zhè yàng

生物系统亿万年来一直都是这样。

Biological systems have been doing this for billions of years.