liquid nitrogen immersion

例句：

1. 1. The process of liquid nitrogen immersion is crucial for the preservation of delicate specimens.
   液体氮浸泡过程对于保存珍贵标本至关重要。
2. 2.During the liquid nitrogen immersion, the sample was carefully placed in a container filled with liquid nitrogen.
   在液体氮浸泡过程中，样品被小心地放入一个装满液态氮的容器中。
3. 3. The liquid nitrogen immersion technique has been used to preserve ancient artifacts for years.
   多年来，液体氮浸泡技术一直被用来保存古代文物。