Sigma.
[医] 千分之一秒
🗣️ 情景例句
My company was the contractor.
我的公司承包了这项工程。
When I had a rest, what were you doing?
当我休息时，你在做什么？
The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
手术持续了4个多小时，非常难做，因为皮肤上覆盖着一层硬硬的树脂。