Once every 100 million years or so, an even larger asteroid may cause a mass extinction; most scientists believe a six-mile-wide asteroid doomed the dinosaurs 65 million years ago.
每隔1亿年左右，一颗更大的小行星可能导致物种大灭绝。大多数科学家相信一颗6英里直径的小行星在6500万年前使恐龙灭绝。
Most scientists believe a six-mile-wide asteroid doomed the dinosaurs 65 million years ago.
大多数科学家相信一颗6英里直径的小行星在6500万年前使恐龙灭绝。
Instead of being driven to extinction by death from above, dinosaurs might have ultimately been doomed by death from below in the form of monumental volcanic eruptions.
最终有可能导致恐龙灭绝的原因很可能是猛烈的火山爆发，而不是以上导致恐龙灭绝的原因。
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