Basis ossis sacri
[医] 骶骨底
🧩 词语组成解析
basis
['besɪs]
n. 基础;主要成分;基准，基本原则;
骨髓腔
🗣️ 情景例句
What floor is the shoe department on?
鞋部在几层？
He is in conference.
他正在开会。
His life shall be at the mercy of the Duke.
他的生命全凭公爵处置。