Dragons live long.
Meaning: This means that dragons have a very long lifespan. It's like saying, Dragons exist for many years.
Choice of Words: Dragons are mythical creatures often depicted as living for a very long time. Live is a verb that means to have life or exist. Long is an adjective used to describe something that has a great duration or extent. In this case, dragons are said to live for a long time as part of their mythical nature.
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