cryogenic preparation

例句：

1. 1. Thecryogenic preparation is essential for the experiment.
   低温准备对于实验至关重要。
2. 2. Thecryogenic preparation was madeusing liquid nitrogen.
   低温准备是用液氮制成的。
3. 3. The cryogenic preparationhas been used in medical research for decades.
   低温准备在医学研究中已经使用了几十年。