Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.
http://www.kedadredger.com/gold-minin

Digital printing machine, also known as universal flatbed printer or flatbed printer, has broken through the difficulties of digital printing technology and realized the true one-shot printing, no plate-making, and full-color image completion at one time.
http://www.yssmdigitalprinter.com/dig

Floor tiles are commonly made of ceramic or stone, although recent technological advances have resulted in rubber or glass tiles for floors as well. Ceramic tiles may be painted and glazed. Small mosaic tiles may be laid in various patterns. Floor tiles are typically set into mortar consisting of sand, cement and often a latex additive.
http://www.nokanitile.com/glazed-tile

Coronavirus disease 2019 (COVID-19) is a contagious disease caused by a virus, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China, in December 2019. The disease has since spread worldwide, leading to the ongoing COVID-19 pandemic.
http://www.modaivd.com/all-poct-produ

Corrugated is the structural form of building materials, which can be made of a variety of special materials. It is mostly made of aluminum, which is used for anti-corrosion and thermal insulation. The dimensions of corrugated are divided into: A, B, C, E and F.
http://www.justucorrugator.com/corrug