Nonfusibility
抗熔性
🗣️ 情景例句
What room are you in, sir?
先生，您住几号房？
This is a chair.
这是一张椅子。
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。