Cissoid
凹边的,蔓叶线的
🗣️ 情景例句
and I'm giving some thought to a new book on a different subject.
如今我又开始在构想另一本不同题材的新书。
What time does the first train to Boston leave?
第一班去波士顿的列车什么时间开出呢？
I'll get you some tea now.
我这就给你们端茶水来。