20世纪20年代，一位古生物学家在一个装着蛋的巢穴附近发现了一只小恐龙的化石遗迹。
In the 1920s, a paleontologist discovered the fossil remains of a small dinosaur near a nest containing eggs.
翼龙是第一批会飞的脊椎动物，它的化石遗迹已经吸引了古生物学家两个多世纪。
The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries.
这些史前黄蜂蜂巢——古生物学家称为遗迹化石——可以追溯到7500万年前的蒙大拿州。
These prehistoric wasp cocoons, known as trace fossils among paleontologists, date back 75 million years to what is now Montana.
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