Septavalency
(=septavalence)[化]七价
🗣️ 情景例句
She likes to go from man to man.
她的男友换了一个又一个。
How was your flight?
你的航班怎样？
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。