Davidite
铀钛磁铁矿, 铈铀钛铁矿
🗣️ 情景例句
I've got to start thinking about college soon.
我很快也得开始考虑大学的事了。
Deliver not your words by number but by weight.
言不在多，而在有物。
Collecting, by occupying spare time so constructively, makes a person contented, with no time for boredom.
收藏活动通过富有建设性地利用业余时间使人感到心满意足，不再有无聊之日。