Sigma.
[医] 千分之一秒
🗣️ 情景例句
By the way, what are you going to do on Christmas?
顺便问一下，圣诞节你打算做什么？
We have a few kitchen things and a dining room set.
我们有一些厨房设备和有餐厅
She was born in 1966.
她生于1963年。