The 1st and 2nd Keys are parent index entries. The &quot; Search term &quot; or the &quot; Alternative entry &quot; appears as a subentry under the 1st and 2nd Keys.
第一个和第二个关键字是父索引条目。“查找条件”或“可选条目”作为子条目显示在第一个和第二个关键字的下面。