Beaverite
铜铅铁矾
🗣️ 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，
Good night,John.
晚安，约翰。
This is done by a great number of ring-shaped air jets on the bottom of the craft.
船底装上大量环状喷气嘴以实现这一目的。