there·for /ðærˈfɔr, ðɛr-/
(ad.)為此;因此
There·for adv. For that, or this; for it.
With certain officers ordained therefore. --Chaucer.
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therefor
adv : (in formal usage, especially legal usage) for that or for
it; "ordering goods and enclosing payment therefor"; "a
refund therefor"