The phrase "a main portion" is correct and usable in written English.
It can be used to refer to the primary or most significant part of something, often in discussions about content, structure, or components.
Example: "In the report, a main portion of the findings highlighted the need for improved sustainability practices."
Alternatives: "a key part" or "a significant section".
The hemispherical hydraulic cylinder also functions as a main portion of crown.
Last week, after a main portion of the first phase of construction was completed, the installation was subjected to load testing, which involved scattering 350 sandbags weighing 50 pounds each and leaving them there for 24 hours.
Hundreds of athletes from quarterback Drew Brees, to Olympic Swimmer Christine Magnusson, and UFC athlete Brandon Vera all use bodyweight exercise as a main portion of their exercise routine.
In this view, small graphics for each slide will appear on the left side of the screen and the currently selected slide will appear in a larger main portion of the screen.
Built in 1875 with a granite ashlar facade and slate roof, the house consists of a three-story main portion and a perpendicular one-story section.
Chicken drumsticks have also been added in either a side or main portion.
I'm not a fan of velcro securing the main portion of a pack, but the Bravo's velcro roll top didn't drive me crazy, though that feat did require thoughtful packing.
The 2009 filing contained a description of podcasting as an outcome of the main portion of the patent, which remained unchanged.
I told him I'd find him the chord progression for that song and later emailed him with the chords to the main portion and a link to a good chart with chords and lyrics.
1. Order an appetizer portion of pasta instead of a main dish portion.
The main portion formed a narrow strip along the western and northern border of Swaziland; and a smaller exclave lay immediately to the north.
