Offhook
[计] 摘机
🗣️ 情景例句
in a horse and carriage.
坐马车。
The abundance of money ruins youth.
钱多毁青年。
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。