列出用来定义字串常数的类别和方法。

Lists the classes and methods used to define string constants.

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您可以自订变数以取代执行期间的字串常数。

You can customize variables to replace string constants at execution time.

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常数是个取代不会变动的数字或字串的有意义名称。

A constant is a meaningful name that takes the place of a number or string that does not change.

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