随着需求扩展，需要包含更多字符和符号，比如法语、西班牙语和数学等式中的字符和符号，ASCII的一个扩展被包含进来。
As the need expanded to include more characters and symbols, such as those found in French, Spanish, and mathematical equations, an extension to ASCII was included.
阿尔文·汉森和保罗·萨缪尔森构建了一些描述经济体某一部分支出的涨跌如何扩展至整个经济体的等式。
Alvin Hansen and Paul Samuelson constructed equations to predict how a rise or fall in spending in one part of the economy would propagate across the whole of it.
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