Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
You know, man's best friend is his dog.
你知道的，类最好的朋友就是狗。
It has been a great year for all of us.
过去的一个，对我们大家来说，是辉煌的一年。
Was it cold yesterday?
昨天天气冷吗？