同位语对被修饰名词的内容予以解释说明。同位语的特点是: 抽象名词在前，表达具体内容的从句在后，一般都用that引导。
1. that引导的同位语从句。
The suggestion that we should develop the natural resources in the region has been discussed.
A century ago, Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears.
Such behavior is regarded as “ all too human” , with the assumption that other animals would not be capable of this finely developed sense of grievance.
2. 同位语中的插入语，目的一般也是为了句子结构平衡。
In the first half of the last century the discovery was made that a magnet could be used to get an electric current.
The boy bore up well when the news came that his father had been killed.
The theory is of great importance that the hotter a body is the more energy it radiates.
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