first degree burn

例句：

1. 1. He sustained a first degree burnon his hand while gardening.
   他在园艺时手被烧伤了。
2. 2. The patient was treatedfor a first degree burn on his face.
   病人的脸被烧伤了，需要治疗。
3. 3. First degree burns are the most common typeof burn injuries.
   一级烧伤是最普遍的烧伤类型。