First, the interpretation of the cluster
1, listening; Have a keen hearing.
2. smart.
Second, word formation
Deaf, intelligent, intelligent, intelligent, enlightened, etc.
form a word
First, deafness [sh and c not ng]?
Hearing loss; Become deaf.
Second, smart [c not ng y ǐ ng]?
Smart.
Third, intelligence [c not ng Hu]?
Smart; Wise.