Constant series
[机] 置换序列
🧩 词语组成解析
🗣️ 情景例句
I love walking in the rain.
我喜欢在雨中散步。
Have you taken a train?
你坐过火车吗？
Usually, he catches the number 11 bus to work, but sometimes he goes by train.
通常他乘11路公共汽车去上班，不过他有时乘火车去。