Sibi
abbr. Smithsonian Institution Bibliographic Information Service 史密森著书目录信息服务会学会
🗣️ 情景例句
We're very lucky, the three of us ...
我们非常幸运， 我们三个……
Happens all the time.
常有的事。
It's about four hundred yards down this street.
城堡就在这条街上，（离这儿）400码左右。