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
If they come home and they're on ...
要是他们回来看见灯开着……。
To start the city planning
着手都市计划
What's the problem with building the new factory then?
那么，建新厂有什么问题吗？