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.

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。

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Suffice it to say that the fresh air required to control pollution levels in a tunnel increases erratically with vehicle speed and traffic density and the design year is important.

这足以说明，由于车辆速度及交通密度的影响，用于控制隧道中污染水平的所需新鲜空气会不规则的增长，且设计年也很重要。

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