Grade estimation
[经] 等级(质量)评定
🧩 词语组成解析
estimation
[ˌesti'meiʃən;ˌestə'meiʃən]
n. 估计; 评价; 判断;尊敬;
🗣️ 情景例句
How soon will my mail be received by the other end?
我的信件多快能被对方收到？
To wait patiently
耐心等待
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。