Ulcus penetrans
[医] 穿透性溃疡
🧩 词语组成解析
溃疡
🗣️ 情景例句
Don't worry about it. It's nothing.
别担心，没事儿。
I want to be a pilot of possible.
如果可能的话，我想做个飞行员。
Who's calling?
是哪一位？