Ssb
abbr. 太空科学委员会（Space Science Board）；选征兵役局（Selective Service Board）
🗣️ 情景例句
If someone doesn't buy it before then,
如果在此之前没有人买走的话。
Could you tell me where is the ticket office?
你能不能告诉我售票处在哪里？
I'm afraid he's out. He won't be back until tomorrow.
对不起，他外出去了，明天才回来。