Ssn
abbr. 子系統號（Subsystem Number）；（美）社會保險號（Social Security Number）；智力嚴重遜常（Severely Subnormal）
??? 情景例句
At the Bronx High School of Science.
在Bronx區的理科中學讀書。
A bad custom is like a good cake, better broken than kept.
壞習慣像鮮餡餅，分食要比保存好。
Then you'll see the sign for the rest rooms.
你就可以看到廁所的牌子了。