depth of frost penotraion

例句：

1. 1.The depth of the frost penotraion is a critical factor in determining the survival rate of plants during winter.
   霜冻深度是决定植物在冬季生存率的关键因素。
2. 2.The scientist measured the depth of the frost penotraion to better understand the impact of climate change on the ecosystem.
   科学家测量了霜冻深度，以更好地理解气候变化对生态系统的影响。
3. 3. The farmer used a thermometer to measure the depth of the frost penotraion, which helped him determine when to start plowing his fields.
   农民使用温度计测量霜冻深度，这帮助他确定何时开始翻耕他的田地。