Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
We have to go pick up Michelle.
我们得去接 Michelle了。
All's fish that comes to his net.
到了网中都是鱼。
By the time you read this, the Hubble's eagle eye will have sent us thousands and thousands of wonderful pictures.
等到你读到这篇文章时，敏锐的哈勃望远镜已经为我们送来了成千上万张精彩的照片。