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同学好
简单来说，margin强调的是百分比，是指边际收益，指增加的部分。profit强调的是绝对值，表示利润，就是去掉本钱后的纯获利。profit margin是利润率。
比如：收入是100， 成本是80，则毛利（gross profit）是20，扣除其他税费之后净利润（net profit）假设是10，那么毛利率（Gross profit margin）=20/100=20%，净利率（Net profit margin）=10/100=10%。
以下是英文版详细解释：
Margin is used to compare A relative to B, where A is part of B. Margin is usually stated as a percentage.
Followings are two examples of margins:
1. Gross profit margin = Gross profit / revenue;
2. Net profit margin = Earning after tax / revenue;
In accounting, a simple expression of a profit and loss statement is as follows:
Revenue 1,000
Cost of good sold -900
Gross PROFIT 100
Operating expenses -10
other expenses -2
tax -3
net PROFIT after tax 85
then, Gross profit MARGIN = 100/1000 = 10%.
Net profit MARGIN = 85/1000 = 8.5%
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PROFIT is a certain amount of benefit obtained from operations of a company or from trading activities. Different from a margin, profit is stated in a full monetary value. In the above example, the gross profit MARGIN is 10% but the Gross PROFIT is 100; and net profit MARGIN is 8.5% but the Net PROFIT after tax is 85.

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