deep freezing of semen

例句：

1. 1. The deep-freezingprocess is crucial for preserving food.
   深度冷冻过程对于保存食物至关重要。
2. 2. The deep-freezing method has been used topreserve ancient relics.
   深度冷冻方法已被用来保存古代遗迹。
3. 3. The deep-freezing technique can extend the shelf life ofperishable goods.
   深度冷冻技术可以延长易腐商品的使用寿命。