Kettnerite
氟碳酸盐铋钙石
🗣️ 情景例句
I studied English in school.
我是在学校里学的英语。
Then,it's usually time to wake up my little brother.
然后，通常是我弄醒我的弟弟的时间。
It is growing cool.
天气渐渐凉爽起来。