The speaker raises serious counterarguments against the reading paragraphs by providing drastically different evidences regarding dinosaurs may not endotherms.
First, the temperature in Polar Regions when dinosaurs lived were warmer than today. Besides, dinosaurs may migrant when the temperature in Polar Regions was cool down. That is, why dinosaur fossils have been discovered in Polar Regions cannot prove dinosaurs are endotherms.
In addition, there is another explanation for dinosaurs' legs underneath body. This also indicates that dinosaurs' legs are positioned underneath their body cannot explain dinosaurs are endotherms. In other words, dinosaurs may not endotherms. This was another part where experience contradicted theory.(第二个点没听懂,我这么写是有点糊弄的)无法支撑起自己的体积。。,这边我也听错饿了。。j囧。。
Lastly, dinosaurs grow with the temperature changes. The passage says that dinosaurs include Haversian canals which usually are the bones of endotherms. However, the speaker talks about dinosaurs grew quickly when the weather was warm and during the cool days they grew slowly. They grew with the temperature around. This characteristic is an evidence of dinosaurs is(两个谓语动词is诶。。) not endotherms. This directly contradicts what the passage indicates.