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
How come you speak such good English?
你为什么能说这么好的英语呢？
I hope you change his decision.
我希望你改变他的决定。
The continents form rugged tablelands which stand nearly three miles above the floor of the open ocean.
大陆是崎岖不平的高地，高出辽阔海洋海底近三英里。