英语语法分析

Anusitis is a difficult condition to define and therefore confusing to study.

肛门炎是一种较难定义的疾病，因此研究起来较易混淆。

"Anusitis is a difficult condition to define and therefore confusing to study, " Dr. Brand replied.

由于肛管炎是一种较难定义的疾病，因此研究起来比较容易混淆。