vascular bundle sheath

例句：

1. 1. The vascular bundle sheath is essential for the proper functioning of the heart.
   血管束带对心脏的正常功能至关重要。
2. 2. During embryonic development, the vascular bundle sheath provides a protective barrier for the developing blood vessels.
   在胚胎发育过程中，血管束带为正在形成的血管提供保护屏障。
3. 3.The vascular bundle sheath plays a crucial role in maintaining the health of the skin and underlying tissues.
   血管束带在保持皮肤和深层组织的健康方面起着关键作用。