化石中的生物是一种和乌鸦体型相仿的原始鸟类，当它在湖面上盘旋时，突然袭来的火山灰使其窒息而亡。
The fossil was a primitive bird the size of a crow that may have been asphyxiated by volcanic fumes as it wheeled above the lakes all those millions of years ago.
化石中的生物是一种和乌鸦体型相仿的原始鸟类，当它在湖面上盘旋时，突然袭来的火山灰使其窒息而亡。
The fossil was a primitive bird the size of a crow that may have been asphyxiated by volcanic fumes as it wheeled above the lakes all those millions of years ago.
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