Petterdite
砷铅矿
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
He established a new business.
他开创了新事业。
I was proud that we had come across something that was completely unknown and valuable and,
让我感到自豪的是，我们在无意中发现了不为世人所知的、有价值的东西，