Ungathered
未配页的图书印张
🗣️ 情景例句
It's good to meet you.
很高兴见到 。
Why Mr. Cooper so tired?Do you have any idea?
为什么库珀先生这样疲倦的?你有想法吗？
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。