Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
Oh, sorry. There must be some mistake.
哦，抱歉，一定是弄错了。
What is it you don't like about winter weather?
你不喜欢冬天什么样的天气？
The open sea was deep and mysterious,
无边无际的海洋深邃而又神秘，