单词学习：rock 名词/动词
rock
/rɒk/
岩石；摇滚乐；摇晃
Professor Gu picked up a smooth rock from the riverbank to show his geology students.
顾老师从河岸上捡起一块光滑的岩石，展示给他的地质学学生看。
单词卡片
卡片已就绪
