tā men shuō zhēn zhèng fàng qì yí gè rén shì wú shēng de ， bú huì bǎ tā liè rù hēi míng dān ， yě bú huì shān chú tā de diàn ...

From four main factors of the traffic people-machine system, people, car, road and environment set out, raising the ...