Sigma bond
[化] σ键
🧩 词语组成解析
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
Or religion unless you know them very well.
除非你和对方很熟。
In doing we learn.
经一事，长一智。
I must go to the butcher's, too.
我还要到肉店去一下。