Richellite
土氟磷铁矿
🗣️ 情景例句
It will take less than 5 minutes to check out.
退房最多只需5分钟。
Excuse me for that.
对不起我为那件事。
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。