Mesonorm
中带标准矿物
🗣️ 情景例句
My company was the contractor.
我的公司承包了这项工程。
Idleness is the root of all evil.
懒惰乃万恶之源。
One is the general atmosphere of secrecy in which it is carried out,
一是科研工作中普遍存在的保密气氛；