Tetraether
四醚
🗣️ 情景例句
I was quite surprised when I read in your letter that you had decided not to finish your studies at the university.
当我在你的信中看到你已决定终止大学学业时感到很是惊讶。
I feel terrible about it.
太抱歉了。
What time would be good for you?
什么时间你合适呢？