研究人员解释说，许多主人将他们的宠物视为家庭成员，并与它们形成密切的社会关系。
The researchers explained that "Many owners regard their pets as a family member, and form close social bonds with them."
研究人员解释说，这项研究表明当我们处于新环境，大脑会保持部分警觉，这样人类就能在各种潜在的危险中保护自己。
The researchers explained that the study demonstrated when we are in a novel environment the brain partly remains alert so that humans can defend themselves against any potential danger.
一些研究人员解释了大多数人是如何与同龄人形成社会群体的。
Some researchers explain how most people form their social groups with people of their age.
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