Celta
[法、瑞土]塞尔塔(空心粘胶长丝或醋酯长丝)
🗣️ 情景例句
What books are required for this class?
这课需要什么样的书？
To chase the thief
追踪小偷
The letter x stands for an unknown number.
字母x代表未知数。