单词学习：tumble 动词/名词
tumble
/ˈtʌmbl/
跌倒，摔倒；翻滚，滚落；（价格、数量等）暴跌，骤降；倒塌；仓促地行动；弄乱
During the outdoor activity, Mr. Gu accidentally took a tumble on the grassy slope, but he got up quickly with a smile.
在户外活动中，顾老师不小心在草坡上摔了一跤，但他很快微笑着站了起来。
单词卡片
卡片已就绪
