Placodine
砷镍矿
🗣️ 情景例句
I'm Susan Stewart.
我是 Susan Stewart。
She began playing the violin when she was nine.
她从九岁就开始练习小提琴。
The system has worked so well, that it has been adopted in other countries too.
由于这种制度行之有效，已被其他国家采纳。