Rhodirite
硼铯铷矿
🗣️ 情景例句
Of course.
当然可以。
Never show the bottom of your purse or your mind.
钱包不露底，思想需保留。
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，