哈特人至今仍过着群居的农耕生活，所以他们经历了几乎相同的环境影响。
They live similar communal farming lifestyles, so they experience common environmental influences.
然而，因为他们大多为群居生活，这可能使得他们成为疾病爆发的源头。
But because they tend to live in clusters, they can be the source of outbreaks.
原角龙是一种食草恐龙，体型和绵阳差不多大小。专家们都认为他们曾在白垩纪时期过着群居的生活。
The Protoceratops was a vegetable-eating dinosaur about the size of a sheep that experts believe lived in herds during the Cretaceous Period.
原角龙是一种食草恐龙，体型和绵阳差不多大小。专家们都认为他们曾在白垩纪时期过着群居的生活。
The Protoceratops was a vegetable-eating dinosaur about the size of a sheep that experts believe lived in herds during the Cretaceous Period.
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