Often a variable is only assigned to once and is used as an (immutable) definition.
通常对变量的赋值只有一次，并被当作不变的对象。
An immutable "variable" is declared with the keyword val (think value object).
一个不变的“变量”可以用val关键字来声明(想象一个值对象)。
An immutable "variable" is declared with the keyword val (think value object).
一个不变的“变量”可以用val关键字来声明(想象一个值对象)。
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