blood sinus

例句：

1. 1. The doctor found a blood sinus in the patient's brain during surgery.
   医生在手术中发现了患者脑部的一个血窦。
2. 2. Blood sinuses are small openings in the skull that allow blood to flow from the brain into the body.
   血窦是颅骨上的小开口，允许血液从大脑流向身体。
3. 3.He was bleeding from a minor cut on his forehead, which is a common source of blood sinuses.
   他的额头上有一个轻微的伤口正在流血，这是常见的出血源之一。