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
When I say something, I mean it.
我说的一定会兑现。
Wasn't the issue settled?
问题不是解决了吗？
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。