血球计

例句：

1. 1. The doctor ordered a blood test to check the patient's vital signs.
   医生要求做一次血液检测来检查病人的体征。
2. 2. Blood tests are essential for diagnosing diseases and monitoring patients' conditions.
   血液检测对于诊断疾病和监测病人状况至关重要。
3. 3. During the examination, the nurse took a blood sample from the patient.
   在检查过程中，护士从病人那里取了血样。