Yǐqián Běijīng mǎn dàjiē dōu shì huángsè de miàndī.
Beijing streets used to be full of yellow minivan taxis.
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history
面的 were ubiquitous in Chinese cities in the 1990s - cheap yellow minivans used as taxis. They were phased out in Beijing around 1999 for safety and image reasons. The word is now mostly nostalgic.