Eucrasite
钍铈矿
🗣️ 情景例句
I am.
我饿了。
I broke 5 cups.
我打破了五个杯子。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。