Necrotizing factors
[医] 坏死毒素
🧩 词语组成解析
[医] 引起坏死的
n. 因素（factor的复数）
🗣️ 情景例句
What's the matter?
发生了什么事？
The phone is ringing.
来电话了。
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，