地下管线信息更新维护
maintenance of underground pipeline update
地下茎更新
Rhizome-wood regeneration
地下水可更新能力
groundwater renewable capability
冠下天然更新
Natural regeneration under canopy
上方天然下种更新法
Natural regeneration under shelter-wood
上更新统下限
the lower age of Late Pleistocene
天然下种更新
natural seeding regeneration
Natural regeneration
上新更新世界线
Pliocene-Pleistocene boundary
肝下下腔静脉
Inferior vena below the liver
视网膜下新生血管
subretinal neovascularization
水下[下水]滑道
under water launching way