Actinium series
[化] 锕系(指89~103号元素)
🧩 词语组成解析
n. 锕\\n[化] 锕Ac
🗣️ 情景例句
As a matter of fact,
事实上，
If you attend the wedding, what would you wear?
如果你参加婚礼，你会穿什么衣服？
The work is coming along quite well.
工作进展得相当顺利。