Orthosilicate
正硅酸盐
🗣️ 情景例句
Oh, Robbie!
哦 Robbie！
Why torture yourself?
你这是何苦呢？
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，