两者不相同的地方是开头字母：b 和 m 。只要记住B打头的是比尔盖兹，因为他很有钱就行了。
【billion】：用在数字或 several，a few 等表示数字的词语之后时，其复数形式为 billion。
n.十亿；数以十亿计；大量；一万亿
adj.（法美）十亿的；（英德）万亿的；无数的
例句：
Exports in June rose 1.5% to a record $30.91 billion.
6月份的出口额上升了1.5%，创下309.1亿美元的历史最高纪录。
Novello says college students will spend $4.2 billion yearly on alcoholic beverages.
诺韦洛说大学生每年在酒精饮品上会消费掉42亿美元。
This has been done by plundering £4 billion from the Government reserves.
这是通过侵占40亿英镑的政府储备金完成的。
This area is an expanse of stones burnt black from billions of years of exposure to the scorching sun.
这个地区是一望无垠的石头,几十亿年来暴晒在烈日之下,都晒黑了。
There are billions of stars in the sky.
天上有无数的星星。
【million】：其复数形式为 millions。
n.百万;
adj.百万的;无数的;
例句：
It also struck a chord in Japan, where the book has sold more than 1 million copies
这本书在日本也引起了反响，销出了一百多万册。
A million miles from the earth, NASA's Advanced Composition Explorer (ace) spacecraft suddenly found itself under assault
离地球大约100万英里的地方，美国国家航空航天局(NASA)的航天器－－高级太空成分探索者(ace)突然遭受打击。
Glasgow, with over one million inhabitants has only about 100 miles of tramway
人口超过一百万的格拉斯哥只有大约一百英里电车线路。
In one large metropolitan area I sureyed, fewer than half the millionaires lived in high-rent districts
在一个大城市城区，也只有不到一半的百万富翁住在房费高昂的地区。
Using radiometric dating methods, Sugden determined that the ash settled into the fissure after a volcanic eruption 8.1 million years ago
用辐射测量鉴定年代的方法，萨格登测定那些灰烬是810万年前火山爆发后沉积在石缝中的。