🧩 词语组成解析
🗣️ 情景例句
Always remember to wash your hands before eating.
用餐前谨记要洗手。
Are you a native speaker of English?
你的母语是英语吗？
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。