原本英文

I think you can use the word" naked" to describe somthing pure without any covering for some extent.

1.the original manuscript; the master copy2.the original (from which a translation, consideration, etc. was made)3.[Informal] originally; formerly

如果是n. original manuscript但原本同义于本来 adv.originally望采纳,祝楼主英语更上一层楼