Purulence is a noun. It names the state when a part of the body has pus in it, or is making pus — that thick yellow (sometimes green) liquid you see in a bad wound or a boil.

Purulence化膿 is a noun是一個名詞 It它 names the state指的是那個狀態 when當 a part of the body身體某個部位 has pus in it裡面有膿 or or is making pus正在產生膿 that thick yellow (sometimes green) liquid那種濃稠的黃色（有時是綠色）液體 you你 see in a bad wound or a boil在嚴重的傷口或膿包裡看到的

Doctors write it in notes: they might say there is purulence, meaning the wound is wet with pus.

Doctors醫生 write it in notes會寫在病歷上 they他們 might say there is purulence可能會說有purulence meaning意思是 the wound是傷口 is wet with pus有膿液滲出

Ordinary people almost never say this word. They say “pus,” or “it’s infected,” or “it’s oozing.” You will meet it in medical English, not in the street or in a café.

Ordinary people一般人 almost never say this word幾乎不會說這個字 They他們 say “pus”會說「pus」 or或 “it's infected”「感染了」 or或 “it's oozing”「在滲液」 You你 will meet it會遇到它 in medical English在醫學英語裡 not in the street or in a café不是在街上或咖啡廳裡

Though actually, a few writers stretch it and talk about “moral purulence,” as if a person or a system were rotten inside. That use is rare and rather bookish. Learn the body sense first, and treat the other as a dark picture, not the main meaning.

Though actually不過其實 a few writers少數作家 stretch it會延伸使用這個字 and而 talk about “moral purulence”講「道德上的化膿」 as if好像 a person or a system一個人或一個體制 were rotten inside內部腐爛一樣 That use這種用法 is rare and rather bookish很少見而且偏書面 Learn the body sense first先學身體上的意思 and而 treat the other as a dark picture把另一個當作一種陰暗的比喻 not the main meaning而不是主要意思