Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
Well, first, you have to turn your hat around like this.
首先 ，你得把你的帽子转一下 ，像这样。
It slipped my mind.
我忘了。
An old watch, by contrast,
然而一只老掉牙的手表，