Sacrotomy
[医] 骶骨[下部]切开术
🗣️ 情景例句
What are you doing up this late?
这么晚你不睡在干什么？
Necessity (or Need) has (or knows) no law.
需要面前无法律。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。