The practical value of knowledge resources possesses popularity , duality of exhaustiveness and non exhaustiveness, and expansivity.知识资源的使用价值具有广普性、非耗竭与耗竭二重性及扩张性....

n.（可）扩大（或扩展、扩张、延伸、膨胀）性（或度）...

expansivity的音标：expansivity的英式发音音标为：[ˌɪkspæn'sɪvɪti]expansivity的美式发音音标为：[]...