subsurface controlled subsurface safety valve

identical unit or proportional unit of the body

time-rock unit =time-stratigraphic unit

anomaly of subsurface fluid

Artificial enamel subsurface lesion

combined control of salinization and subsurface wa

combined control of salinization and subsurface waterlogging

combined controlling of surface and subsurface water logging

complex surface and subsurface geologic condition

comprehensive stress from surface and subsurface waterlogging

constant zone of subsurface temperature

constructed subsurface flow wetlands

continuous action from multiple process of surface and subsurface waterlogging

continuously suffering subsurface waterlogging

decline of subsurface flow

downgoing subsurface intrabed multiple

dynamic subsurface performance

electromagnetic subsurface probing

Equatorial Pacific subsurface