subsidence
n
1 [U] process of subsiding (subside1) 下降; 回落; 回降
the gradual subsidence of the river 河水的逐渐回落.
2 [U, C] process or instance of subsiding (subside2, 3) (土地或建筑物等的)下陷
a building damaged by subsidence 因地基塌陷而毁坏的建筑物
The railway line was closed because of
(a) subsidence. 这条铁路因土地下陷而停止运营.