想想这个社区的其他服务人员。我们有收集垃圾的人，他们负责保持社区卫生；我们有道路工人，他们竖起、修理交通标志牌，维修道路，不仅保护着我们自己，也保护着我们的汽车！
Think about all the other service workers we have in this community. We have people who collect waste and rubbish and keep our community sanitary. We have road workers who put up and repair traffic signs and fix holes in the streets to protect not just us, but our cars!
目前我国道路交通标志牌使用板材大都是铝合金，由于铝合金板属于不可再生资源，随着资源逐年递减而成本逐年增加。
At present, aluminum alloy, which belongs to non-rebirth resources, is mostly used as board materials of traffic signs in China. The cost increased with the yearly reduction of this resource.
利用眼动仪系统纪录分析了在不同车速条件下车辆通过不同字高的交通标志牌时驾驶员眼睛注视点和注视时间的分布规律。
With the eye tracker, the eye fixation and fixation time distribution in different speeds are analyzed when the car passes through traffic signs with different font height.
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