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Does anyone know what 'pay back times' could mean? I am learning about energy heat transfer if that helps. I'm not lazy in that I can't be bothered to search for it myself, but I was unsure as whether 'pay back times' was intended to be a figure of speech (hence quotation marks)... my teacher used them when she wrote it herself so I don't know what I am supposed to be looking for.Thanks in advance to anyone who helps.(I don't really want to ask her before the lesson, she might think I'm a bit of a fool...)
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