To mitigate the visual "popping" during the detail level transit, we introduce a deferred merging method to realize the geomorphing in terrain mesh refinement.

为了减少相邻帧画面在地形不同层次细节之间变化所引起的几何跳跃，采用了滞后合并的方法来实现动态构网过程的几何过渡。

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But if fatigue overtakes you, then slip down a level and meet the Personal Rapid Transit or podcars.

当然，如果你走累了，可以到街道下一层乘坐个人快速运输系统和个人轨道车。

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Based on survey data, the approach is applied to evaluating travel information acceptance level of transit passengers.

以实际调查数据为依据，运用该方法对公交乘客的出行信息接受水平进行评价。

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In 1979 3M revamped its technology--sold under the Opticom brand--to allow it to recognize two different priority levels: a high level for emergency vehicles, which could force traffic lights to change immediately and a lower level for transit vehicles, which could hold off changing the light entirely if changing the light to green would snarl traffic.

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The below-street-level New York Transit Museum Store in downtown Brooklyn takes underground standards to a new level with antique subway token cufflinks, monogrammed mosaic tiles and subway map shower curtains.

BBC: One-of-a-kind holiday shopping in NYC

As we've been reporting, in the wake of today's bombings in London, US officials have raised the terror alert level for mass transit systems.

NPR: New York, Los Angeles Step Up Security