Gerhardtite
铜硝石
🗣️ 情景例句
You would be well-advised to book in advance.
你还是提前预订较为稳妥。
Newspapers are the world's mirrors.
报纸是世界之镜。
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。