单词学习：rubbed 动词过去式/过去分词
rubbed
/rʌbd/
摩擦过的；擦亮的；磨损的
The old wooden table was rubbed smooth by Teacher Gu over many years.
那张旧木桌被顾老师经年累月地摩擦得光滑了。
单词卡片
卡片已就绪
