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The phrase "a number of key differences" is correct and usable in written English.
It can be used when discussing multiple important distinctions between two or more subjects.
Example: "In comparing the two theories, there are a number of key differences that must be considered."
Alternatives: "several important differences" or "multiple significant distinctions".
Exact(18)
We identified a number of key differences in genes implicated in developmental processes across the different life stages.
However, a number of key differences emerged.
There are a number of key differences between App Inventor 2 and its original incarnation.
There are a number of key differences between the buying and selling of a tangible good and that of a professional advisory service.
However, they have a number of key differences.
There are a number of key differences between Facebook News Feeds and MySpace Friends Updates.
Similar(42)
In this study we systematically identified a number of key quantitative differences between the event reporting in media-based IBC data and field report-based SIGACT military data.
We systematically identify a number of key quantitative differences between the event reporting in the two datasets and demonstrate that even for subsets where both datasets are most consistent at an aggregate level, the daily time series and timing signatures of events differ significantly.
The review identified a number of key organisational differences in the provision of postnatal care between private and public hospitals.
Mr Umunna said: "Whilst there is much on which Jeremy and I agree, there are a number of key points of difference on policy which I believe it would be dishonest to deny exist".
Our findings point to a number of key assumptions and structural differences that seem to jointly drive the variations we observe, across these studies.
More suggestions(18)
a number of fundamental differences
a number of major differences
a number of substantial differences
a number of significant differences
a couple of key differences
a number of key posts
a number of key areas
a number of artistic differences
a number of key concepts
a number of key ministers
a number of architectural differences
a number of genetic differences
a number of methodological differences
a number of surprising differences
a number of interesting differences
a number of key policies
a number of key recommendations
a series of key differences
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com