Celina
[人名] 塞莉纳; [地名] [美国] 塞莱纳
🗣️ 情景例句
May I ask where you are from?
我可以请问你是哪里人吗？
When the sun comes in, the doctor goes out.
阳光入室，医生出屋。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
这种通讯联系要靠21厘米波段，即每秒1420兆周的精确无线电频率。