A heading node may, in turn, contain sub heading nodes ( level 2 ) and may also contain some sentences. 一个标题节点,依次,可以包括子标题节点(层次2),还可以包含有一些句子。
Because of time limitation, the statistic analysis of this thesis only proves its feasibility, and the final result is only sub heading for the whole standard. 由于时间的限制,本文的统计分析仅限于证明该方法的可行性,因此最终结果只是整个标准的一个一级标题及其所属二、三级标题。