Ulceration is the noun. It covers two closely joined things, and English lets it swing between them.

Ulceration潰瘍形成 is the noun是名詞 It它 covers two closely joined things包含兩個緊密相關的東西, and English而英文 lets it swing between them讓這個字在兩者之間游移

First, the process: the tissue breaking down and opening into sores — 'ulceration of the stomach lining took several weeks'. Second, the result you can actually see: the sores themselves, taken together — 'there was ulceration across the whole area'. That second use is why doctors can say 'extensive ulceration' where you might expect 'many ulcers'.

First首先, the process指的是過程: the tissue breaking down and opening into sores組織崩解、裂開形成潰瘍口 — 'ulceration of the stomach lining took several weeks'「胃壁潰瘍形成花了好幾週」 Second第二, the result you can actually see指你實際看得到的結果: the sores themselves, taken together那些潰瘍本身，整體來看 — 'there was ulceration across the whole area'「整個部位都有潰瘍」 That那個 second use第二種用法 is why就是為什麼 doctors can say 'extensive ulceration'醫生可以說'extensive ulceration' where you might expect 'many ulcers'在你可能會預期說'many ulcers'的地方

Notice that in this second use it behaves as an uncountable noun: you say 'some ulceration', not 'an ulceration' or 'three ulcerations'. (You will occasionally see a plural in older medical writing meaning individual sores, but modern usage avoids it.) This is a formal medical word — it belongs to reports, textbooks and doctors talking to each other.

Notice that要注意 in this second use在這第二種用法裡 it它 behaves as an uncountable noun是當不可數名詞用: you你 say 'some ulceration'會說'some ulceration', not 'an ulceration' or 'three ulcerations'而不是'an ulceration'或'three ulcerations' (You你 will occasionally see a plural偶爾會在較舊的醫學文章裡看到複數形 in older medical writing meaning individual sores指的是一個個獨立的潰瘍, but modern usage avoids it不過現代用法會避免這樣用。) This這 is a formal medical word是個正式的醫學詞——it它 belongs to reports, textbooks and doctors talking to each other屬於報告、教科書和醫生之間的對話

A patient would say 'I've got ulcers' or 'it's gone all open and raw'; the notes would say 'ulceration'. If you must choose one word from this family to know, know 'ulcer'; ulceration is what you read, not what you say.

A patient病人 would say會說 'I've got ulcers'「我長潰瘍了」 or 'it's gone all open and raw'或「整個都破皮、紅腫」; the notes病歷 would say則會寫 'ulceration'「潰瘍形成」 If you must choose one word from this family to know如果這一家族的字只能記一個, know 'ulcer'就記'ulcer'; ulceration而ulceration is what you read是你會讀到的字, not what you say而不是你會說出口的字