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
Nobody. That's the problem.
没有人。这就是问题所在。
We can't make a decision without thinking it over.
我们不能不考虑，就作决定。
I'm looking for a pair of black shoes.
我在找双黑色的鞋。