Oxyfluoride
氟氧化物
🗣️ 情景例句
Well, wouldn't you know it?
嘿，你想知道这么件事吗？
Shall I carry this for you?
要不要我帮您拿这件东西？
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，