Ssts
abbr. signaling and supervision techniques study 信號傳送與監聽技術研究; space surveillance and tracking satellite 空間監視與跟蹤衛星; space-based surveillance and tracking system 天基監視與跟蹤系統
??? 情景例句
It does sound tempting.
聽起來很誘人。
I'm sure I've forgotten something ,but it's too late now.
我肯定我忘記了一些東西，但是它現在是太遲了的。
That's very important.
這很重要。