1. She feels insulted at his display of selfishness when he shows a lack of interest at learning her name.2. Morals are declining more and more each day. Every day one can see more displays of selfishness, lack of respect for others, lack of concern for our environment.3. Scientists study the phenomena of nature.
 display phenomenon人為特質的現象就可用 display，例如自私的現象可說 display of selfishness. 而自然的現象可用 phenomenon.
My sister is bad-tempeed and would snap at anybody whenever she feels like it.