a picture printed from an engraved or etched plate

engraved

engraved big weevil

engraved copper plate

engraved copper plate printing

engraved copper roller printing

engraved cylinder

engraved glass screen

engraved thick weevil

1000m mining depth

137Cs depth distribution

2 D depth averaged flow and sediment model

20 ℃ isothermal depth

26Al and 10Be depth profile method

320 m water depth

32-bit color depth

380 nm aerosol optical depth

3D prestack depth migration

3-D prestack depth migration