Septavalency
(=septavalence)[化]七价
🗣️ 情景例句
Is it too early to call Mr. Carlson?
现在打电话给Carlson先生会不会太早了？
He learns English every day.
他每天都学英语。
A recent article in a weekly newspaper, for instance,
例如，最近一家周报刊登了一篇文章，