deteriorate

如果沟通中断，关系将会迅速恶化。

If communication breaks down, the relationship will quickly ___deteriorate.

如果没有适当的维护，这栋老建筑的结构将持续恶化。

Without proper maintenance, the old building's structure will continue to ___deteriorate.

如果不及时修理，这栋老房子的状况会进一步恶化。

The condition of this old house will ___deteriorate further if not repaired in time.