Cacheutaite
硒铜铅矿
🗣️ 情景例句
You want to bet?
想打赌吗？
Save while you may, no morning sun lasts a whole day.
能节俭时就节俭，朝阳难照一整天。
Even more processes are never patented at all but kept as secret processes.
更多的工艺过程根本就不会取得专利权，而是作为秘方保存着。