Actinide series
[机] 锕系元素
🧩 词语组成解析
n. [化]锕类
🗣️ 情景例句
He's not making much progress with his English.
他的英语进步不大。
Dogs that run after many hares kill none.
多谋寡成。
That's the end of the tour.
参观就此结束了。