Pus is the thick yellowish — sometimes greenish — liquid that a body makes when a part of it is infected. You see it in a boil, a dirty wound, or a bad spot on the skin. It is made of dead white blood cells, germs, and broken tissue.

Pus膿 is the thick yellowish是一種濃稠、偏黃 — sometimes greenish有時候偏綠 — liquid that a body makes身體製造出來的液體 when a part of it is infected在身體某個部位受到感染的時候。You see it in a boil, a dirty wound, or a bad spot on the skin你會在膿包、髒掉的傷口，或皮膚上發炎的地方看到它。It is made of dead white blood cells, germs, and broken tissue它是由死掉的白血球、細菌和被破壞的組織組成的。

English speakers say the word freely at the doctor’s, though it sounds a bit ugly, so some people prefer “discharge” on polite forms. You can have a little pus or a lot; doctors may drain it.

English speakers說英文的人 say the word freely at the doctor's在看醫生時會很自然地說出這個詞, though it sounds a bit ugly雖然聽起來有點不太好聽, so some people prefer "discharge" on polite forms所以有些人在比較正式的場合會用"discharge"這個字。You can have a little pus or a lot你可以有一點點膿，也可以有很多; doctors may drain it醫生可能會把它引流出來。

Though actually, older English had other words for this liquid (now almost dead), and pus, borrowed from Latin, took their place. It is a thing-word, not a polite-table word, but it is not slang either — it is the ordinary name of a real body product.

Though actually不過其實, older English had other words for this liquid早期英文對這種液體本來有別的字 (now almost dead)（現在幾乎已經不用了）, and pus, borrowed from Latin, took their place後來從拉丁文借來的pus取代了它們的位置。It is a thing-word它是一個實際指稱事物的詞, not a polite-table word不是餐桌上禮貌會講的詞, but it is not slang either但也不算俚語 — it is the ordinary name of a real body product而是身體真實產物的普通說法。

One more messy truth: the colour is a clue, not a full diagnosis. Yellow pus often means infection, but only a doctor should decide what to do.

One more messy truth還有一個微妙的地方: the colour is a clue, not a full diagnosis顏色只是線索，不是完整的診斷。Yellow pus often means infection黃色的膿通常代表有感染, but only a doctor should decide what to do但該怎麼處理，還是要由醫生來判斷。