How is 得 used in this sentence？

Question

I have always known 得 as an adverb. For example 跑得很快 ，run quickly or run very fast. The following sentence > 只有懂得节制欲望的人，才能享受到人生的真正乐趣 means "Only a person that understands (how to) control his desires can achieve true happiness." However, I don't understand the use of 得 here. I think I would have written it without the 得. Or is 懂得 a special phrase? Thank you!

Answer 1

懂得=to know+sth./how

Meaning that, in Chinese, there always is the 得 between 懂know and its complement.

Answer 2

You guessed it right. 懂得 is actually only one compound word for "to understand, to know, to grasp".