Complete the following statements with proper words or expressio

Complete the following statements with proper words or expressions according to the course book.The word "picture" originally denoted only "painting", but now has come to include "drawings" and even "photographs". This is an example shows to illustrate ( ).
【正确答案】：EXTENSION
【题目解析】：本题主要考查词义的扩大。picture “图画”一词最初仅指“painting（绘画）”，但现在已经包含了“drawing（绘画）”甚至“photograph（照片） ”。这个例子显示了意义的扩大。