Sigma.
[医] 千分之一秒
🗣️ 情景例句
I hope they aren't lost.
但愿没丢才好。
The fox may grow grey, but never good.
狐狸活到老，永远难变好。
But none of them has been turned to stone yet!
但到目前为止还没有一个变成石头呢！