Mainboard
n. 主机板，主板
🗣️ 情景例句
Have you ever been there?
你去过那儿吗？
I want a cup of coffee.
我想要一杯咖啡。
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。