Sigma
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
The new students seem to be shaping up quite nicely.
新生们看来表现得相当不错。
It says a storm may come next month.
天气预报说下个月会有一场暴风雨。
You could save a lot if you would order a little more.
如果你单子下得多一点，可以省不少的钱。