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flightless是什么意思，flightless翻译
Flightless Birds: A Unique Aspect of Evolution
Flightless birds, as the name suggests, are birds that cannot fly. While flight
is a common characteristic among most birds, there are some species that have
evolved to be flightless. These birds have certain adaptations that allow them to
survive and thrive without the ability to fly.
One of the most well