Unduloid
波状体
🗣️ 情景例句
Then why don't we go look at this house, too?
那我们何不也去看看这栋房子？
No, I'm listening to the radio.
没有，我在听收音机。
He agreed that a train did come into the station at the time on the paper and that it did stop, but only to take on mail, not passengers.
搬运工说，正如纸条所说，确有一趟火车在那个时刻到站，但它只停站装邮件，不载旅客。