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
Yeah. I really did do a good job, didn't I?
是的 ，我确实拍得不错， 对不对？
Who has no haste in his business mountains to him seem valleys.
做事不急，履险如夷。
The police had been told that a bomb had been planted on the plane.
有人报告警察，说飞机上安放了一枚炸弹。