Internal coating used in high pressure, large diameter and long distance gas pipeline has two main functions, one of them is anti corrosion and the other is drag reduction.

高压、大口径、长输天然气管道采用内涂层主要具有两大功能，一是防腐蚀，二是减阻。

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Currently, the research target of this realm is raising the drag reduction efficiency, at the same time, is increasing its anti-to shear function and lower the usage cost as far as possible.

目前，这一领域的研究目标是在不断提高其减阻效率的同时，尽量增强其抗剪切稳定性及降低其使用成本。

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It is very petite in size, will not take up too much computer resources, unlike other anti-virus software installed will drag the entire computer speed.

它的体积非常娇小，不会占用太多计算机资源，不像其它防毒软件安装之后会拖累整台计算机的速度。

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"Not only do they signal a local economy in decline, they also become a hotspot for anti-social behaviour and drag down the whole feel of an area, " she said.

BBC: Councils in 'ghost town' warning