Zeolon h
分子筛(含有H离子)
🗣️ 情景例句
Mr. Richard Stewart. Richard Stewart
先生。
It's earier to run down the hill than go up.
下山容易上山难。
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，