形容词
中文翻译：退化的
同义词：
['relict', 'vestige']
例句：
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1.The vestigial wing of the bird is a remnant of its ancient flight ability.
鸟的残留翅膀是其古老飞行能力的遗迹。
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2. The vestigial organ still exists in some species, but it is not functional.
这种残留器官在某些物种中仍然存在，但已失去功能。
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3. The vestigial tail was once used for balance and propulsion, but now it serves no practical purpose.
残存的尾巴曾用于平衡和推进，但现在它没有实际用途。