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
and remember the meaning of Thanksgiving.
来追忆一下感恩节的意义。
You can't tell anybody by what they seem.
你不能凭外表判断人。
Where did you learn to speak English?
你从哪里学会说英语的呢？