Burton's sign
[医] 伯顿氏征, 铅毒性龈缘, 铅线, 蓝线
🧩 词语组成解析
🗣️ 情景例句
What events are happening on campus?
校园里有什么事件发生？
I've got a pain in my back.
我背疼。
This letter's full of mistakes. I want you to type it again.
这封信里错误百出。我要你重打一遍。