Menalgia
[医] 痛经
🗣️ 情景例句
At six o'clock this evening.
今晚六点。
The failure drove him hito despair.
这次失败使他绝望。
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。