您可以使用各种各样的方法模式在飞机跑道上降落，这取决于由天气、交通密度、风速等等因素决定的空中交通控制指导。

You can land on an airstrip with various approach patterns, depending on air traffic control guidelines due to weather, traffic density, wind speed, and so on.

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密度表现了围绕测试所编码的模式。

The density shows up in the patterns codified around Test.

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如果车辆密度大幅高于上述数字，则车流模式开始出现不稳定现象。

If the traffic density increases much above that, the flow pattern begins to become unstable.

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