Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
When I first graduated from college.
那时我刚从大学毕业。
I remember the girl whose father earns $ 10000 a month.
我记得那个女孩的父亲一个月赚一万元。
I find young people exciting.They have an air of freedom,
我觉得年轻人令人振奋，无拘无束。