溝 - gutter, ditch, sewer

oceanic trench; deep-sea trench; deep

ditch; drain; gutter; trench

ditch; drain; gutter; trench

drainage ditch; canal

subterranean drain; culvert; conduit

lateral sulcus (brain structure); Sylvian fissure; lateral fissure

sulcus; groove in the surface of the brain

Chinese pond mussel (Sinanodonta woodiana)

drainage; gutter; ditch

fluting; grooving

keyway

nasolabial sulcus; nasolabial groove; nasolabial fold