Petit's triangle
[医] 波替氏三角, 腰三角
🧩 词语组成解析
🗣️ 情景例句
After studying an hour, I finally got the hang of the lesson.
我学习了一个小时，终于理解了这一课的要点。
A good face is a letter of recommendation.
好的相貌就是一封推荐的介绍信。
You were very angry!
你火气真大！