Marmag
氧化镁
🗣️ 情景例句
Yes, indeed.
对， 没错。
I have not traveled everywhere in Guangzhou.
我还没有游遍广州。
Many people in industry and the Services, who have practical experience of noise,regard any investigation of this question as a waste of time;
在工业部门工作和在军队中服役的许多人对噪音有切身的体会，他们认为对这个问题进行调查是浪费时间，