bursa propulsoria

例句：

1. 1. The doctor examined the patient's blood pressure and found it to be within normal range.
   医生检查了患者的血压，发现它在正常范围内。
2. 2.The scientist observed the cells in the bursa propulsoria and noted their unique structure.
   科学家观察了细胞在血管球中的情况，并注意到它们独特的结构。
3. 3.The researcher discovered that the bursa propulsoria plays a crucial role in immune system function.
   研究者发现血管球在免疫系统功能中起着至关重要的作用。