1．  The animal mind works by the principle of instinct. Beavers do not go to engineering school to learn to build dams. They know how to do it naturally.fficeffice" />

  The animal mind works by the principle of instinct. Beavers do not go to engineering school to learn to build dams. They know how to do it instinctively.

What’s the difference between the two sentences? P42

2.It is a close relative of depression and attention deficit disorder, that procratinations tend to be besieged by feelings of low self-esteem and are abnormally prone both to bouts of paralyzing anxiety and illogical of resentment.

How to translate the sentence? The given answer cannot assure me.  P213

3. For Yu Qiuyu, the ease with which he treats history as a subject matter comes from his deep understanding of it and his aesthetic tendencies, from which we can discern a strong feeling toward life.  What does the red part refer here? P227