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
I think New York has all the conveniences--
我觉得纽约具备了一切便利的条件
The masses have boundless creative power.
群众有无尽的创造力。
What do the machines do? asked Jim.
“这些机器做什么用？”吉姆问。