Actinium
n. 锕\\n[化] 锕Ac
✅ 同义词
🗣️ 情景例句
Something old.
旧的东西。
Knowledge is power.
知识就是力量。
One can tell the difference almost at a glance, for a spider always has eight legs and insect never more than six.
人们几乎一眼就能看出二者的差异，因为蜘蛛都是8条腿，而昆虫的腿从不超过6条。