The head and body elements are children of the HTML root element; title is a child of head and then the text "trees, trees, everywhere" is a child of title.
head和body元素是html根元素的孩子；title是head的孩子，而文本“trees, trees, everywhere”是title的孩子。
A study from the University of the West of England suggests that changes in female body temperature, caused by the monthly cycle, are at the root of particularly colourful dreams.
西英格兰大学的一项研究暗示，女性异常鲜明梦境的根源是她们体温的变化，而该变化是由每月的周期引起的。
The root of anything that can penetrate the human body triggers an ancestral fear, according to one neurologist.
一位神经学家说，任何能穿透人体的东西都能触发一种原始的恐惧。
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