经常会见到一个名词短语对前一个词进行解释说明，这便是同位语。请看下列句子：We have two foreign teachers, Canadian and __ American.We have two foreign teachers, a Canadian and an American.我有2个外教老师，他们是谁呢？逗号后面的部分进行解释说明，一个加拿大人一个美国人The word "Mid-Autumn" first appeared in the famous ancient book Zhou Li[The Zhou ......
