Redledgeite
硅镁铬钛矿
🗣️ 情景例句
No. I need to stop by the shop.
不，我要先到商店停一下。
How much?How many?
共多少？
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，