The paper analyzes the problem in separating oil tar by the mechanize trough. It raises the concrete transform plan, which gains the well economic efficiency in reality.

分析了机械化澄清槽分离焦油过程中存在的难题，提出了具体的改造方案，并且在实际中取得较好的经济效益。

youdao

The oil has hardened to tar.

油已硬化成沥青了。

《柯林斯英汉双解大词典》

Soft parts, including skin, hair, and viscera of ice age mammoths, have been preserved in frozen soil or in the oozing tar of oil seeps.

冰河时代猛犸象的柔软部位，包括皮肤、毛发和内脏，被保存在冻土或石油渗出的焦油中。

youdao

The proposed Keystone XL pipeline would carry heavier crude oil produced from tar sands in Canada.

VOA: special.2011.07.08

"We think that for the South Florida parks, Dry Tortugas,Big Cypress, Everglades and Biscayne, it is predominately going to be a tar ball event because the oil is weathering."

VOA: standard.2010.05.26

But the sight of workers wearing white protective suits and gloves hauling in tons of oil-contaminated waste - including bags of sandy tar balls, vegetation,used oil booms, rags and other clean-up supplies - has caused alarm among some Gulf coast communities.

VOA: standard.2010.08.05

Production of oil from tar sands bitumen produces between three and five times the greenhouse gas pollution of conventional oil production.

FORBES: How Bridgestone's Innovative New Tires Will Save You Fuel

Extracting oil from tar sands causes more carbon emissions than traditional drilling.

ECONOMIST: Canada: A sticky ending for the tar sands | The

And Canada is still fighting for an exemption from a rule inserted into the 2007 Energy Independence and Security Act that bars the American government from buying fuels whose production causes more greenhouse-gas emissions than conventional petroleum sources, as producing oil from tar sands does.

ECONOMIST: Stephen Harper looks to Washington, not Alberta