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
I'll pick you up.
我去接你。
The two contestants are neck and neck with 20 points each.
比赛双方各得20分，打成平局。
We have our evening meal at about a quarter past six.
我们6：15分左右吃晚饭。