Kettnerite
氟碳酸盐铋钙石
🗣️ 情景例句
It is said that another suicide bombing occurred in the country yesterday.
据称，昨天在这个国家又发生了一起自杀式炸弹事件。
The staff in this shop is very helpful.
这家商店的店员很热心。
To be really happy and really safe,
一个人要想真正感到幸福和平安