qí chē / qián / qǐng / xiān / bǎ / fǎn guāng jìng / tiáo dào / néng / kàn qīng / hòu fāng / chē liàng / de / wèi zhì

骑车前，请先把反光镜调到能看清后方车辆的位置。

Before riding, first adjust the reflector so that you can clearly see vehicles behind you.