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Discover LudwigThe phrase "contain only" is grammatically correct and can be used in written English.
It means that something includes or has only the specified thing or things and nothing else. Example: The list of ingredients on the label should contain only natural, organic products. In this sentence, "contain only" is used to clarify that the list of ingredients should not include any artificial or synthetic ingredients.
Exact(60)
They contain only warm water.
Paragraphs can be pages long, and contain only one sentence.
They all think their boardrooms contain only strong personalities.
Among living stenolaemates most zooids contain only testes (male gonads).
Java API code libraries contain only high-level code.
But aerosols don't contain only nutrients.
(The theory might contain only tautologies).
SDCs contain only sample information.
These data sets contain only topological information about the structures.
These small cells contain only one sector each.
Many patent databases contain only citations of national patents.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com