Sootfall
n. (工业区的)煤烟降落(量)
🗣️ 情景例句
You know, it hung over my crib, too.
要知道 ，我的小床上也曾有过它。
Many good cows have evil calves.
很多好母牛，会生坏小犊。
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，