Fluctuations
n. 起伏现象；变动；波动（fluctuation的复数）
🗣️ 情景例句
I'm pleased to meet you, Mr. Peter.
皮特先生，很荣幸认识你。
Don't forget to print airmail on the letter.
不要忘记在信封上印上航空邮件
They all went up some narrow steps into a large room.
他们全都登上这些狭窄的台阶，接着进入一个大房间。