映射基本上是一一对应的；除了有必要对嵌套标记的量化和交替使用中介体之外（中介体名称用前导下划线标出来）。
The mapping is basically one-to-one; except it is necessary to use intermediaries for quantification and alternation of nested tags (intermediary names are marked by a leading underscore).
听录音，用下划线标出关键词。
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