Ssb
abbr. 太空科学委员会（Space Science Board）；选征兵役局（Selective Service Board）
🗣️ 情景例句
He told me
他告诉我
I guess that's Ok. What time should I check in?
我想这正合适。我应该什么时候去办理登机手续呢？
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。