liquid nitrogen freezing

例句：

1. 1.The liquid nitrogen freezing technique is used to freeze the tissue quickly.
   使用液态氮冷冻技术可以快速冻结组织。
2. 2. The surgeon used a liquid nitrogen freezing device to remove the tumor.
   外科医生使用液态氮冷冻设备来切除肿瘤。
3. 3. During the operation, the surgeon performed a liquid nitrogen freezing procedure on the patient's leg.
   手术过程中，外科医生对患者的腿部进行了液态氮冷冻处理。