JLPT N2
数億年
It expresses an approximate time of hundreds of millions of years. You’ll often see it in science.
Readings
Noun
Several hundred million years
An immense and approximate period of time lasting for hundreds of millions of years, typically used for geological or astronomical timescales.
Example
恐竜 が 地球 に 住んで いた の は 、 数億 年前 の こと です 。
Dinosaurs lived on Earth several hundred million years ago.
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