Watchkeepers
(watchkeeper 的復(fù)數(shù)) 值班人員
??? 情景例句
It's a nap. Tomorrow morning at ten o'clock.
簡單得很。明早十點。
Don't take it the wrong way.
別誤會我的意思。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
這種通訊聯(lián)系要靠21厘米波段，即每秒1420兆周的精確無線電頻率。