frost penetration

例句：

1. 1. The ice on the lake is starting to thaw as the weather warms up.
   随着天气变暖，湖上的冰开始融化。
2. 2.The farmer observed that the soil was experiencing a freeze-thaw cycle.
   农民观察到土壤正在经历一个冻融循环。
3. 3. The researcher found that the freeze-thaw effect could significantly affect the structure of soil particles.
   研究者发现冻融效应可以显著影响土壤颗粒的结构。