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The phrase "are mainly composed" is correct and usable in written English.
It can be used to describe the primary components or elements that make up a particular subject or object.
Example: "The committee members are mainly composed of experts in environmental science."
Alternatives: "are primarily made up" or "consist mainly of".
Exact(60)
The albums under the label are mainly composed by Key's signature composers: Jun Maeda, Shinji Orito and Magome Togoshi.
The central plateau and the eastern coast are mainly composed of gneiss, granite, quartz, and other crystalline rock formations.
Foam glass blocks are mainly composed of borosilicate.
The substances are mainly composed of asphaltene and preasphaltene.
Cosmic rays are mainly composed of galactic and solar particles.
The valley fills are mainly composed of estuarine muddy silts.
All of the samples indicated that the TiO2 nanowires are mainly composed in rutile phase.
Both the 1-D nanostructures and nanospheres are mainly composed of δ-phase Gaq3 [32] 32].
Therefore, the as-cast films are mainly composed of iron oxide hydroxide particles and F127.
It indicates that the architectures are mainly composed of Zn element (58.26%) and oxygen element (41.74%).
They found that the structural characteristics of Ag2S and Ni/Ag2S are mainly composed of Ag2S.
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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