Scientists still struggle to understand the physiology of avian flight, but light bones and an intricate collaboration among chest and wing muscles appear essential.

科学家们仍在努力研究鸟类的飞行原理，但轻盈的骨架以及胸脯与翅膀肌肉之间的复杂而精妙的协调似乎必不可少。

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For a time, he thought of having his bones with the treasure chest, though how that might have been accomplished is unclear.

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