Petrostroma
石质海绵属
🗣️ 情景例句
Let's go for lunch. I'm buying.
去吃午饭吧， 我请客。
There have been a lot of changes here in the last 20 years.
在这20年里这里有很多变化。
I hope to conclude some business with you.
我希望能与贵公司建立贸易关系。