单词学习：ebb 动词/名词
ebb
/eb/
（潮水）退落，衰退，减少
As the tide began to ebb, Mr. Gu reminded the students on the beach to be careful of the slippery rocks.
当潮水开始退去时，顾老师提醒沙滩上的学生们注意湿滑的岩石。
单词卡片
卡片已就绪
