free subsidence

例句：

1. 1.The ground is sinking due to the free subsidence of the foundation.
   由于地基的自由沉降，地面正在下沉。
2. 2.The company has been experiencing free subsidence issues in its production facilities.
   该公司在其生产设施中一直面临着自由沉降问题。
3. 3.Free subsidence can lead to structural damage and safety hazards.
   自由沉降可能导致结构损坏和安全风险。