Ultramicropore
超微孔
🗣️ 情景例句
You don't know what you are talking about.
你不知道你在说什么。
This is a very bad performance.
这是一次非常糟糕的演出。
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。