We first introduce methods of finding the sum of the first n terms for an arithmetic sequence of higher order.

我们首先介绍了高阶等差数列前 n 项和的求解方法。

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The net result is that if you need to work with only part of the document model (the "first" part, in document order terms), AXIOM delivers great performance.

最后的结论是，如果只需要处理文档模型中的某些部分（如按文档顺序的“第一”部分），AXIOM 提供了优秀的性能。

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You can see that once you become accustomed to thinking in terms of higher-order and first-class functions, you can reduce (pun intended) a lot of noise in your code.

您会看到，一旦您习惯了从高阶和一级函数的角度思考，您就能减少（一语双关）代码中无用的部分。

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So, in practical business terms the first order of business to find someone who needs that specific solution to a problem.

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In order to begin listing options on a company, exchanges must first propose the terms of the options and file for approval with Options Clearing Corp.

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