其基本概念与把表示层和代码分隔开的其他框架相似。
Basic concepts resemble other frameworks that separate the presentation layer from the code.
当我们用数学把它们表示出来时，我们发现他们使用的数学是相似的。
We write them out mathematically, and we see they use very similar mathematics.
不同的供应商使用不同的或相似的术语来表示影响许可的不同事物，从而造成更多的费解。
To make things a little more confusing, different vendors use different or similar terms to mean different things that affect licensing (the point of that sentence was to be confusing).
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