既然如此...
well,then...
such being the case...
in that case...
as this is the case...
this being so...
as things are...
Well,then,say no more about it.
既然如此,不用再说了.
Since that is so,there is no more to be said.
既然如此,再没什么可说的了
Such being the case,I'll go there alone.
既然如此,我只能一个人去了.
In that case,you don’t have anything to worry about.
既然如此,你没有什么可担心的.
He is very sick,such being the case,we should take care of him.
他病得很重,既然如此,我们应该照顾他.