of course是怎么来的?学过英语的人都知道of course这个短语的意思,但这个短语是怎么来的呢?分开看的话怎么

这个问题我也刚好想到,确实,每个字、词语都有它的来源,但一些已经古久不可考.
推荐这种问题直接问google,搜索例如："origin of '……' "
这个问题外国朋友们也有疑惑,下面把对我理解有帮助的两处解释以及解释的出处复制给你.第二条比较中肯,有引经据典也有解释理解,
Phrase of course is attested from 1540s; literally "of the ordinary course;" earlier in same sense was bi cours (c.1300).(Source: Etymonline.com)
Kimber Wiggs（一位网友）:As my own matter of course,I turn to the Oxford English Dictionary for my answer.According to that tome,the phrase "of course" first appeared in the mid-1500s and was used as an adjectival phrase meaning "belonging to the ordinary procedure; customary; natural."

Here is an example of a sentence using "of course" from 1578:The friendshippe betweene man and man as it is common so is it of course.

You can see where "of course" is synonymous with "natural." (Source:http://www.***.com/What-is-the-origin-of-the-phrase-of-course)

探索发现：Of course的由来，语法上怎么解释？什么的缩写吗？
这个问题外国朋友们也有疑惑，本人认为：of course 就是 matter of course 的缩写，意即：自然进程的事、正常秩序的事，引申为：自然的事、正常的事，最后缩略为 of course ，自然是"自然"b ，当然是"当然"了...