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
I know.
我知道。
The great and the little have need one of another.
伟大与渺小相得益彰。
I did it, I'm so happy now.
我做到了，现在我很满意。