Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
Susan, will you marry me?
Susan，你愿意嫁给我吗？
One cannot make a silk purse out of a sow's ear.
朽木不可雕。
Well, I don't think any of them is interesting.
我认为哪个都没意思。