当然还有一个大问题：这些符号实际的意义是什么？
One huge question remains, of course: what did the symbols actually mean?
证券文档(20833个)使用实际的证券符号和名称，表示在美国交易的大多数股票和共同基金。
Security documents (fixed at 20833) represent the majority of US-traded stocks and mutual funds and use actual security symbols and names.
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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