Phoscorite
磁铁橄磷岩
🗣️ 情景例句
and you can listen to him over the phone.
而且你可以在电话中听到他的声音。
What does it matter?
有什么关系？
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。