A stratified flow in a horizontal pipe represents the most important form of high concentration powder transport flow.

水平管内分层流动是高浓度粉体输送流型中最重要的形式，研究其阻力特性有着重要的意义。

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It may distort the natural flow of commerce, services and transport.

它可能会阻碍地区间的商业、服务和交通的自然流通。

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Barriers to the free flow of goods and services, Labour and capital are being pulled down around the world, aided by huge improvements in communications and transport.

货物、服务、劳动力和资本自由流动的壁垒在全球范围内被打破，辅以沟通手段和物流产业的显著进步。

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Newcastle had been chosen because the city had "a long track record of making the city more intelligent using transport systems in order to keep the traffic flow moving", she said.

BBC: Green light sat-nav trialled in Newcastle

The Bedfordshire-based firm, which employs a total of 450 staff, has recently agreed a deal to share data with Transport for London in an effort to improve traffic flow in the capital.

BBC: NEWS | Business | Trafficmaster profits accelerate

Transport chiefs will instead report back to councillors in November with options to improve traffic flow.

BBC: Traffic light in Shinfield Road