名词
中文翻译：Unknown
同义词：
['avian veins', 'avian venous system']
例句：
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1. The wings of the bird have intricate veins that help it fly.
鸟的翅膀上有复杂的静脉，帮助它飞行。
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2. The study of avian venous systems is crucial for understanding flight mechanics.
研究鸟类静脉系统对于理解飞行机制至关重要。
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3. The wing venation of the bird is unique and contributes to its ability to fly.
鸟的翅膀静脉独特，有助于其飞行能力。