Schulzite
单硫锑铅矿
🗣️ 情景例句
I don't know if I can get to sleep.
我不知道我能否睡得着。
I got sick and tired of hotels.
我讨厌旅馆。
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。