Sigma.
[医] 千分之一秒
🗣️ 情景例句
Jazz music is performed at many dinner parties.
在很多宴会派对里都有爵士乐的演奏。
A fall into the pit, a gain in your wit.
吃一堑，长一智。
Farm labourers said that they always woke up to find that work had been done overnight.
雇工们说，常常一早起来发现有人在夜里把活干了，