Q.s.
[医] 适量, 足量
🗣️ 情景例句
My career as a fashion designer
时装设计事业
To wait hungrily
饿着肚子等着
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。