Plagioclasite
斜长岩
🗣️ 情景例句
We tested it last week on twelve- to fifteen-year-olds,
我们上一周曾在十二岁至十五岁的孩子中试过这项游戏，
What are you doing?
你正在做什么？
He had been the first to turn a telescope to the sky,
他是第一个把望远镜对准天空的人，