"Elastic pps" 用英语可以说成 "pps that are elastic". "Elastic" 是形容词，意思是有弹性的、能够伸缩的。
"Elastic" 这个词来源于希腊语 "elastos"，意思是可以弹性恢复原状的。
例句：
Her elastic pps made it easy for her to play the trumpet. (她有弹性的嘴唇使她很容易演奏小号。)
The elasticity of his pps made it possible for him to make a wide range of facial expressions. (他嘴唇的弹性使得他能够做出各种各样的面部表情。)