shaking the needle

例句：

1. 1. The doctorwas shaking the needle to check the patient's blood pressure.
   医生正在摇动针头来检查病人的血压。
2. 2. The oldman was shaking the needle in his hand, trying to find a vein.
   老人正在手心里摇动针头，试图找到一根静脉。
3. 3. The nurse was shaking the needleto administer an injection.
   护士正在摇动针头来注射药物。