Acid catalyst
[机] 酸催化剂
🧩 词语组成解析
🗣️ 情景例句
The performance of the stock market can reflect economic conditions.
证券市场的表现能反应经济状况。
What day was yesterday?
昨天是星期几？
Fortunately, nothing was found and five hours later we were able to take off again.
幸运的是，什么也没有找到。5个小时后，我们又起飞了。