Different types of values exist such as character string, date, decimal, and so on.
存在不同类型的值，如字符串、日期(date)、小数(decimal)等。
An atom is a basic piece of data, such as a number, string, or character.
原子是一个基本的数据，比如一个数字、字符串或者字符。
A value such as a number, a character, or a string of characters.
诸如数、字符或字符串的值，该值不能修改。
A value such as a number, a character, or a string of characters.
诸如数、字符或字符串的值，该值不能修改。
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