Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
What happened?
发生了什么事？
The uneducated are more to be pitied than blamed.
对未受过教育的人们更多的是要可怜而非责怪。
How old are you in the picture?
相片里的你多大了？