Sigma.
[医] 千分之一秒
🗣️ 情景例句
According to the newspaper, Sally has quit her job.
报上说莎里辞职不干了。
Behind bad luck comes good luck.
塞翁失马，焉知非福。
As soon as one bee discovered the honey, many more came to it one after another in a short time.
一旦有一只蜜蜂发现了蜂蜜，在短时间内就有许许多多的蜜蜂一个接一个地飞向那里。