seasonally frozen ground

例句：

1. 1.The farmers have to deal with the seasonal freezing of the ground during winter.
   农民们不得不在冬天应对地面的季节性冻结问题。
2. 2.The scientists are studying the effects of climate change on the seasonal freezing of the ground.
   科学家们正在研究气候变化对地面季节性冻结效应的影响。
3. 3.The construction workers had to dig deep into the seasonally frozen ground to find the water source.
   建筑工人不得不深入到季节性冻结的地面深处寻找水源。