单词学习：defunct 形容词
defunct
/dɪˈfʌŋkt/
已失效的；已废止的；已倒闭的；已死的
The old teaching method mentioned by Teacher Gu is now defunct.
顾老师提到的那个旧教学方法现在已经废止了。
单词卡片
卡片已就绪
