Samaria
[化] 氧化钐
🗣️ 情景例句
Hold Gerald's hand, please. Great!
请握住Gerald的手。很好！
Who is he?
他是谁？
If explosives are used, vibrations will cause the roof of the mine to collapse.
如果用炸药爆破，震动会引起矿顶塌落。