亿年 meaning in English
b.y
Examples
- It has a half-life of about 41/2 billion years .
它的半衰期大约为45亿年。 - At some time more than five billion years ago the universe started .
在50亿年前的某个时候，宇宙开始形成。 - The sun has been emitting energy at this rate for billions of years .
太阳以这样的强度辐射已有10亿年之久。 - As a slowly contracting dwarf the star may remain luminous for billions of years .
收缩较慢的白矮星仍会发光几十亿年。 - By this means the age of the earth had been estimated at several hundred million years .
用这个办法推算出地球的年龄是数亿年。