Flat-bottom boats have carried eighteen million cubic yards of dredged material to the island.

VOA: special.2009.10.06

He says,"provincials are like mold, burrowing in their little plots, or frogs at the bottom of their puddles, engaged in sordid, trivial rivalries, moved by petty jealousies, avarice and material interests.

他说,乡下人就像模子里刻出来的,在他们的自留地里乱挖一气,或者在泥浆里面挖青蛙,从事着肮脏,没什么竞争性的工作,为嫉妒,贪婪和物欲所驱动

耶鲁公开课 - 1871年后的法国课程节选

Among the new measures proposed are the phasing out of bottom trawls, the heavy gear that scrapes material from the bottom of the sea - fish, coral and anything else in its way.

BBC: Fishing's global footprint

Dredging: excavation, digging, scraping, draglining, suction dredging to emove sand, silt, rock or other underwater sea-bottom material.

UNESCO: L O S S A R Y

OLETs rely on three layers of material, with the bottom layers carrying a charge, the middle layer (the meat in this high-tech sandwich) emitting photons when excited by the bottom, and the top layer selectively letting those photos through.

ENGADGET: Organic Light Emitting Transistors might make us forget all about OLED