在埃及沙漠中挖掘时，古生物学家们发现了巨大的骨骼化石，这似乎是有史以来体型第二大的恐龙。
While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.
随着其他大型恐龙的灭绝，使得Raptorex有机会将体型进化成硕大型，最终成为巨大的霸王龙。
As other large dinosaurs became extinct, this left the path clear for Raptorex to expand in body size and ultimately become the giant Tyrannosaurus rex.
科学家知道体型庞大的哺乳类们在恐龙灭绝后的几百万年就进化了出来。
Scientists knew that extremely large mammals evolved within a few million years after the end of the dinosaurs.
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