maxillary bud

例句：

1. 1. The maxillary bud is the first sign of a baby's teeth coming in.
   上颌芽是婴儿牙齿开始长的第一个迹象。
2. 2. During the growth process, the maxillary bud undergoes significant changes.
   在生长过程中，上颌芽经历了显著的变化。
3. 3. The dentist carefully removed the maxillary bud to prevent infection.
   牙医小心翼翼地切除了上颌芽以防止感染。