Such computation come out the weight when dinosaur is living: The first pace, press certain contractible proportion, make the model of the dinosaur that be measured; The 2nd pace, measure the volume that gives model dinosaur; The 3rd pace, according to the bulk of model dinosaur and contractible scale, cipher out is measured dinosaurian real volume; The 4th pace, with the alligator that is born now kind specific gravity replaces dinosaurian proportion (because of alligator kind the relationship kissing a predestined relationship with dinosaur is closer, their proportion should be similar) , multiply on dinosaurian real volume, gain the real weight of the dinosaur that be measured.

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