1，There is, I think, many truth in Patricia Nelson Limerick’s observation that “lecturing is an unnatural act, an act which God did not design humans.


The strange, almost incomprehensible fact is that many professors, just as they feel obliged to write dully, they believe that they should lecture dully.

1.there be句型
主干：there is truth
1）I think 插入语
2）in Patricia Nelson Limerick’s observation that “lecturing is an unnatural act, an act which God did not design humans. 是介词短语作状语。其中：that “lecturing is an unnatural act, an act which God did not design humans.是observation的同位语从句。其中： which God did not design humans是an act 定语从句。
大意：在我看来，Limerick的言论颇有真实之处。他认为，讲课是一种不自然的行为，这一行为上帝当初并没给人类设计。
2.主干：fact is that
1）The strange, almost incomprehensible 是fact的前置定语。
2）that many professors, just as they feel obliged to write dully, they believe that they should lecture dully.是表语从句。其中：just as they feel obliged to write dully是 professors的非限制性后置定语从句。many professors+they believe 是表语从句的主谓语。that they should lecture dully是表语从句中的宾语从句。
大意：几乎不可理解的怪事在于：许多教授，就如同他们感到被迫枯草乏味地进行写书一样，他们认为，他们的讲课也应该是沉闷乏味的。

1）an act 删去
2）第一个they 删去