Ulcus cruris
[医] 小腿溃疡
🧩 词语组成解析
溃疡
🗣️ 情景例句
we would go down to the beach and catch crabs,
我们走到海边抓螃蟹，
You're sure of passing the exam if you work hard.
只要用功，主汪定能考及格。
but where had it come from?
但它是从哪儿来的呢？