narrow feathers and weak flight muscles suggest it was not a powerful flier.

狭窄的羽毛和柔软无力的飞翔肌暗示孔子鸟并非是个高超的飞行大师。

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If so, breakdown of their flight muscles may prevent them reaching their destiny.

即使如此，飞翔肌肉的衰竭，可防止它们再次迁飞。

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The flight muscles of insects could not function nearly as effectively without such a quick means of oxygen delivery.

如果没有这种可以快速输送氧气的方法，昆虫这些可以飞行的肌肉组织几乎不能有效地起作用。

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