Lithophysa
石核桃; 石泡
🗣️ 情景例句
He is working on a book about the Vietnam War.
他正在写一本关于越战的书。
John is not forty-five yet,is he?
约翰不够45岁,是吗？
With these words the tiger jumped into the river. He did not come out again.
说完这些话，老虎就跳进河里去了。他再也没有上来。