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
You lost the election,
尽管你输了，
If you want knwledge, you must toil for it.
若要求知识，必须刻苦学习。
Do you see the big gate over there?
你看见那边的大门了吗？