短语和例子 several billions of people 几十亿人。 Billion electron-volts 十亿电子伏。
the number that is represented as a one followed by 9 zeros 同义词：one thousand million, 1000000000,
the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen 同义词：one million million, 1000000000000,
a very large indefinite number (usually hyperbole); "there were millions of flies" 同义词：million, trillion, zillion, jillion, gazillion,
denoting a quantity consisting of one thousand million items or units in the United States
denoting a quantity consisting of one million million items or units in Great Britain
例句与用法
1.
It has a half-life of about 41/2 billion years . 它的半衰期大约为45亿年。
2.
Pennsylvania sits on 35 billion tons of coal . 宾州煤的蕴藏量为三百五十亿吨。
3.
But these imports came to nearly 127 billion dollars . 但是，这些进口商品的价值总额却接近1270亿美元。
4.
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。
5.
The universe as a whole contains billions of comparable galaxies . 整个宇宙，包含亿万个可以比拟的银河系。
6.
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。
7.
A bank had billions of dollars in clients' trust funds to invest . 银行吸引了几十亿美元的客户信托金供投资之用。
8.
The savings due to increased health would be about 2 billion annually . 由于增进了健康，每年节约为20亿美元左右。
9.
The youngest rocks found on the moon are 3 billion years old . 在月球上发现的地质年代最晚的岩石已有30亿年历史了。
10.
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。
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