Ssts
abbr. signaling and supervision techniques study 信号传送与监听技术研究; space surveillance and tracking satellite 空间监视与跟踪卫星; space-based surveillance and tracking system 天基监视与跟踪系统
🗣️ 情景例句
Yes. Yes, sir.
是的。是的。
I've changed my mind.
我已经改变主意。
He knows English better than I.
他比我懂英语。