- A wall of ash and debris hundreds of kilometers thick...
一道粉尘和碎片组成的墙 厚达数百公里 - that enveloped the globe.
覆盖了整个地球 - The cloud blocked out the sunlight,
乌云遮住阳光 - leading to the death of almost all dinosaurs...
导致恐龙几乎全部死亡 - ...and three-quarters of life on Earth.
地球上四分之三的生命化为乌有 - The annihilation was global.
毁灭是全球性的 - It was the world's fifth mass extinction.
这是世界上第五次大规模灭绝