Petscheckite
铌钽铁铀矿
🗣️ 情景例句
Do you mind if I smoke?
我抽烟你介意吗？
May I borrow some books?
我可以借几本书吗？
I'm going to the shops. I want to buy some food for supper this evening.
我要去商场，想买些东西为晚饭做准备。