Thorotrase
胶质二氧化钍
🗣️ 情景例句
When my girlfriend rings me out of the blue, I'm in a good mood for the rest of the day.
我突然接到女朋友的电话，接下来的一整天我的心情都很好。
This is the book that I promised to lend you.
这就是我答应借给你的那本书。
I don't know his number. Did you write it down?
我不知道他的电话号码。你记下来了吗？