Coach drivers know, for example, that chewing betel nut can cause cancer, but many of them will take the risk in order to keep up their energy levels, even though everyone's lips become oddly red.
同理可證，很多長途客運司機都了解嚼檳榔可能致癌，但為了維持行車的體力與精神，還是人人一口鮮紅唇色。