“known as the secular...”做后置定语修饰“a pattern ”,但是“a pattern ”在整个句子中做什么成分?But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half eve

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“known as the secular...”做后置定语修饰“a pattern ”,但是“a pattern ”在整个句子中做什么成分?
But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height.

可以把“a pattern ” 看作独立成分,也可以把它看作前面整个句子的同位语.

noun phrase