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
The aquarium was so exciting.
水族馆真的很好玩。
For a lost thing care nothing.
一事之失，不必介意。
Seeing is believing.
百闻不如一见。