In public relations,changing the subject is called "bridging," and experts say you can do it effortlessly whether you follow a few steps.whether you've watched any of the presidential debates, and you've no doubt seen some bad examples of changing the subject. Whether the candidates completely ignore the question and talk approximately something unrelated or exercise an awkward transitional sentence,it's uncomfortable and makes them look like they occupy something to hide.
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Source: fastcompany.com