Kerchenite
纤磷铁矿
🗣️ 情景例句
You haven't been around much lately.
最近你在家的时候不多。
What kind of newspapers do you read?
你读什么样的报纸？
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.
历史学家迄今认为日历是随农业的问世而出现的，因为当时人们面临着了解四季的实际需要，