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
I'm leaving for Beijing on a four-day tour.
我马上要去北京旅游4天。
The frog in well knows nothing of the great ocean.
井底之蛙不知汪洋大海。
I agree that it is a difficult situation.
我同意，这种情况很难办。