Polyfluoride
多氟化物
🗣️ 情景例句
Let's lake this one step at a time.
做这事我们要一步一步来。
How are you feeling today?
你今天感觉怎么样？
Unfortunately, the show was one of the dullest we have ever seen.
不幸的是，这次演出是我们看过的最乏味的演出了。