他们可以通过把语法树回馈给编译集来创建语义模型，从而用符号数据对其进行注解。
A semantic model is created by feeding a syntax tree back into the compilation so that it will be annotated with symbol data. The semantic model can then be queried for information such as.
针对实际应用中待压缩数据可能来自不同的符号集，提出了一种新的算术编码方案。
For the compressing data may come from varied collection of symbols, a novel arithmetic coding is presented.
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