Mesothoriumii
[化] 新钍II; 228Ac
🗣️ 情景例句
Do we have to bag our own groceries?
我必须自己装我们买的商品吗？
The doctor said it's just a slight infection, There's nothing to worry about.
医生说只是轻微的感染，不需要担心。
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186，000英里的速度在一年内走的距离，