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 think Michelle is better off staying where she is.
我觉得Michelle待在原地比较好。
Please proceed with your presentation.
请开始你的简报。
On her way home she bought a new pen at a shop.
回家路上，她在一家商店买了一支新钢笔。