As my studies have advanced, I have been increasingly impressed with the functional similarities between insect and vertebrate societies and less so with the structural differences that seem to constitute such an immense gulf between them. 句中两个现在完成时用法是表示事情一直...
One difficulty, however, was that few of the remaining 97 percent
recorded their thoughts or had them chronicled by contemporaries. Faced with
this situation, many historians based their investigations on the only records
that seemed to exist: birth, marriage, and death records. 中心词是97 perc...