CGA【3】 Built-in functions

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Built-in functions 内置功能 Functions always return a value and do not alter the current shape (with the exception of probability functions which change the state of the shape's random number generator).函数总是返回一个值并且不会改变当前的形状(概率函数除外,它改变了形状的随机数生成器的状态)。