Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
I fell out of the boat!
我摔到船外去了。
Fire, water, and money are good servants, but bad masters.
水火金钱是忠仆，使用不当是祸首。
The thieves dropped the torch and ran away as quickly as they could.
小偷扔下了手电筒，飞快地逃走了。