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The phrase "are mainly composed of" 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 Earth's atmosphere is mainly composed of nitrogen and oxygen."
Alternatives: "are primarily made up of" or "consist mainly of".
Exact(60)
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.
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.
From these analyses, we can conclude the products are mainly composed of VN and carbon.
Time series data are mainly composed of seasonal pattern and trend pattern.
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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