Sinuidal
正弦波; 正弦形
🗣️ 情景例句
What would you say is the most popular sport in your country, Mr. Lu?
陆先生，你们国家什么运动最流行？
I wonder what happened to him.
我不知道他出什么事了。
You can never turn the clock back.
时光不能倒流。