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。
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.
交通密度能通过菜单中旳滑动条来控制。
Traffic density can be controlled via the menu by way of a slider.
随着中国城市化进程的加快，高密度城市中的交通已经成为亟需研究的重要课题。
With the rapid development of urbanization in China, transportation in a high density city has been regarded as an important issue of the day.
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