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Discover LudwigThe phrase "in the upstream" is correct and usable in written English.
You can use it to refer to something that is happening at a higher level or earlier in time than the situation or context you are discussing. For example, "We had to make changes to our plan due to changes in the upstream process."
Exact(60)
In the upstream direction the successive contours represent higher elevations.
With Mubarak's overthrow, a new optimism surfaced in the upstream countries.
This will create severe unbalance in the upstream network.
The river, it is true, does provide a year- round means of communication, but only in the upstream direction.
Re-sequencing flexibility is limited by the precedence relationship among jobs in the upstream conveyors.
It was operated fully continuous and automated in the upstream and the downstream part.
The present review provides recent trend of nanotechnology in the upstream oil sector research.
SimFurnace is a multimedia simulation of the crude furnace in the upstream end of the refinery.
Barbels spent successively less time when transversing the pools in the upstream direction.
However, in the upstream link a substantial difference was depicted between the diurnal patterns.
The simulated results show that NO forms mainly in the upstream region of the combustor.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com