Cfels
(cfel 的复数) abbr. Cerenkov free electron laser 切伦科夫自由电子激光器
🗣️ 情景例句
who spent the last five years
用过去五年的时间
To catch the ball
捕球
Yes, it is. Why don't you take off your sweater?
是啊，你何不脱了羊毛衫呢？