使用算术表达式基于初始文本或属性值进行计算。
Computed using an arithmetic expression on the original text or attribute value.
只要没有混合的类型表达式，就可以在常数说明中使用算术运算符。
You can use arithmetic operators within your constant declarations as long as there are no mixed type expressions.
对于实际出现的符号，会使用算术编码，相对于其预测分发进行编码。
The symbol that actually occurs is encoded relative to its predicted distribution using arithmetic coding.
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