单词学习：obsolescence 名词
obsolescence
/ˌɒbsəˈlesns/
过时；陈旧；淘汰
The rapid pace of technological change has led to the obsolescence of many devices that Teacher Gu used just a few years ago.
技术变革的快速步伐导致顾老师几年前还在用的许多设备都过时了。
单词卡片
卡片已就绪
