原标题：M与MM分别代表什么？What does M and MM stand for?
Definition of M
M的定义
The Roman numeral M is often used to indicate one thousand.
在罗马数字中M经常代表一千。
Example of M
M的代表
An expense of $60,000 could be written as $60M. Internet advertisers are familiar with CPM which is the cost per thousand impressions.
6万美金可能经常被写为60M。网络广告人非常清楚CPM这个名词，CPM的意思是Cost Per Thousand Impressions(每一千个展示的成本).
The letter k is also used to represent one thousand. For example, an annual salary of $60,000 might appear as $60k instead of $60M.
字母K也被用于代表一千。例如：年薪6万美金可能被显示为$60K,而不是$60M。
Definition of MM
MM的定义
The Roman numerals MM are used to indicate one million.
罗马数字MM被用于表示一百万
Example of MM
MM的代表
Sales of $3,000,000 might be written as $3MM.
三百万美金可以被写为$3MM
I have seen one million represented by mn and also by m (both lower case).
我看到过一百万被用mn和m来代表的(都是小写字母)
Hence, you might see $1,400,000 expressed as $1.4 million or $1.4MM or $1.4mn or $1.4m.
因此，你可能看到$1,400,000用$1.4 million或$1.4MM或$1.4mn或$1.4m来表达的。
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