🧩 词语组成解析
🗣️ 情景例句
You really ought to take some time off.
的确应该休一休假。
Grocery bills are expensive.
食品价格昂贵。
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。