How is 由此 (yóucǐ) = "herefrom" used?
由(from)

此(this)

由此 = from this

此 here is an adjective (this),  


  Question: How is 由此 used?


由此 (from this) can be used to modify many different omitted object 

For Example:


由此上楼 = '由此(處)上楼' -  'from this (location) go upstairs'
由此可见 = '由此(事情/ 事实)可见' -  'from this (affair/ fact) we can see'
由此出发 = '由此(地/ 点)出发' - 'set off from this (place/ point)' 
由此终结 = '由此(时)终结' -  'end from this (moment)'