Alfin catalyst
[化] 醇烯催化剂; 醇钠烯催化剂
🧩 词语组成解析
🗣️ 情景例句
It's the world's largest island, but it's also the world's smallest continent.
它是世界上最大的岛屿，同时也是世界上最小的洲。
It's not up to his usual standard.
这次没有达到他平时的水平。
Twenty year!That's long time.
20年！这个时间可不短。