true capillary

例句：

1. 1.The true capillaries in the skin are responsible for transporting oxygen and nutrients to the cells.
   皮肤中的真毛细血管负责将氧气和营养物质输送到细胞。
2. 2. The study of blood vessels is essential for understanding the human body's internal workings.
   研究血管对于理解人体内部运作至关重要。
3. 3. The doctor carefully examined the patient's veins and capillaries to determine the cause of his illness.
   医生仔细检查了患者的静脉和毛细血管，以确定他的疾病原因。