混合煤煤粉的燃烧率并不是所配单种煤燃烧率的算术迭加，在一定条件下要优于所配单种煤燃烧率的算术迭加值。

The combustibility of mixing coal is not equal to the arithmetic plus of each combustibility of the single blend coal, the former is excelled by the arithmetic plus in some condition.

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算术逻辑单元，用来进行算术逻辑运算。

The arithmetic logic unit (ALU), which performs arithmetic and logical operations.

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作为例子，我们将要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。

As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.

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So now I'm actually doing some math, but here's some nuances that we're going to start to trip over.

现在实际上我在做一些算术，但是我们,将会被一些细微的差别所阻塞。

哈佛公开课 - 计算机科学课程节选

But nevertheless, let's just go with this for a minute, and if we suppose that it took about a generation to enter the land so you see, I've done the math on the side here.

无论如何，我们还是要稍微讨论一下，假设，进入这块土地要一代人的努力,你看，我已经在这边做了算术。

耶鲁公开课 - 旧约导论课程节选

It actually doesn't do anything at the end of the day because I am performing this math.

实际上，最终它什么都不会做,因为我在演算这个算术。

哈佛公开课 - 计算机科学课程节选