Kerchenite
纤磷铁矿
🗣️ 情景例句
The only-child generation brings about many new social problems.
独生子女一代带来了许多新的社会问题。
It's time to begin.
到开始的时候了。
It cuts a clean cylinder of rock,
这种钻头能切割一段光滑的圆柱形岩石，