Ssn
abbr. 子系统号（Subsystem Number）；（美）社会保险号（Social Security Number）；智力严重逊常（Severely Subnormal）
🗣️ 情景例句
That's the worst part--making decisions.
最伤脑筋的是要作决定。
If he doesn't, will you fix it?
如果他不，你会修理它吗？
Bonny, take the next dirt track on the left. That will take us down into the valley.
波尼，沿着左边的下一个土路走。我们将沿路而下进入河谷。