An alternative theory is that of Bowlby, which is that they're drawn to their mother for comfort and social interaction as well as fear of strangers.

另一个理论是鲍尔贝提出，他们被妈妈的安慰,和社会互动吸引,同时他们害怕陌生人。

耶鲁公开课 - 心理学导论课程节选