We will begin with a simple narrative. Visitors to London hear a warning in the underground or subway that has become well-known since the end of the 1960s: Mind the gap between the train and the platform. This expression makes sense, as it warns passengers that there is often a space or uneven level between the underground or subway carriage door and the platform. By warning passengers to be careful when they get off the train, so when they cross over from the train onto the platform, the voice that permeates the London Underground, with its unmistakable red and blue logo, helps passengers and prevents liability in their transportation. At the same time, it also metaphorically makes us recognize that (as also in life, generally speaking) there are almost always two edges or margins, with a certain distance between them.
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