精细结构常数实际上是其他几个能在任何物理学教科书中找到数值的物理常数合成，同它的名称稍微有些名不副实。

Slightly belying its name, the fine-structure constant is actually a compound of several other physical constants, whose values can found in any physics textbook.

youdao

例如，您可以宣告列举来当做一组与每周日期关联的整数常数，接著在程序码中使用日期的名称而不是它们的整数值。

For example, you can declare an enumeration for a set of integer constants associated with the days of the week, and then use the names of the days rather than their integer values in your code.

youdao

当变量用来表示用户在命令行上或环境中所自定义的常数时，习惯上会全部以大写来编写其名称。

Variables representing constants a user might want to customize on the command line or in the environment are written in all uppercase, by convention.

youdao

This is what's called the Bohr radius, and we'll explain - hopefully we'll get to it today where this Bohr radius name comes from, but for now what you need to know is just that it's a constant, just treat it like a constant, and it turns out to be equal to or about 1/2 an angstrom.

它叫做玻尔半径，我们后面会解释,希望我们今天可以讲到,波尔半径这个名称的由来，但现在你们只要记住,它是一个常数，只要把它当做一个常数对待，它等于,或者是1/2埃。

麻省理工公开课 - 化学原理课程节选