Retinas
视网膜
🗣️ 情景例句
and a book of photos about the United States still feels right.
而一本关于美国的摄影集仍然很有前景。
The mills of God grind slowly but sure.
天网恢恢，疏而不漏。
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。