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.
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.
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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