boundary line of two times between earth excavation area and earth fill area

Earth Day [first Earth Day in 1970]

180° curved duct with rectangular cross-section

3D curved prestressing tendon

3-D curved roof

3D curved surface

3-D curved surface

3-D curved surface processing

3-D free curved surface

6-node curved quadrilateral element

90curved

a curved box girder bridge

acutely curved clamp

arc curved face

backward curved blade

backward curved vane

backward-curved

block curved box girder

cable-stayed curved beam structure

Chopping knife with curved surface and straight edge