Sigma.
[医] 千分之一秒
🗣️ 情景例句
He ventured upon an enterprise.
他大胆地开始了他的事业。
The used key is always bright.
常用的钥匙总是光亮的。
I think we just had a misunderstanding about the plan, but I was very disappointed not to be going out.
我想我们只是对于外出计划有误解罢了，不过没能外出我很失望。