提问 The course is of three years' duration.此句子的的结构是怎么的啊?我为什么用OF?

提问 The course is of three years' duration.此句子的的结构是怎么的啊?我为什么用OF? That is of course The a___ of the course is to improve your waiting in the course of change the course of what is the fist course of a Wester meal called? 英语翻译1,The new harbour is in course of construction.2,Fossils were found in the course of the work. pay interested to 意思 of course 用法 列举 of course the moon is in the busile 分析 good at 等于 The difference is,of course,one of policy,rather than of strategy. The Course of Life 歌词 the course of one's 英语翻译生活的过程充满了艰苦The course of life is enough of difficulties Of course there is a c___ in front of the desk. the food there is cheap and it comes very quickly.Of course it is d____. The end of the course,but I know that this is only just beginning The course is the first of its kind among middle schools in Shanghai . 英译汉:Of course the sun!it is bigger and brighter than the moon. The course is the first of its kind among middle schools in Shanhai.的意思