Polybromocarbon
多溴烃
🗣️ 情景例句
but in the end the voters will have to decide.
但最后却要由选民来决定。
How did you do it?
你是怎样达成它的？
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。