Sigma electrons
[化] σ电子
🧩 词语组成解析
[计] 求和\\n[医] σ(希腊文第十八个字母)
n. 电子( electron的复数形式 )
🗣️ 情景例句
Look, who's here, Peter!
看，这是谁，彼得！
Come in,please.
请进！
A man was walking through a wood and he came across a woodcutter.
一个人正步行穿过一片树林，他遇见一个伐木工人。