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
Will it cost for the transfer?
转车要钱吗？
How awful.
多可怕呀！
Thank you.
谢谢。