I think such sentences are unnecessarily obscure by omitting key words (the, a, some etc) that could clarify what is meant. language learners' achievement gap (the achievement gap of language learners) language learners' achievement gaps (the individual or various achievement gaps of individual or various language learners) language learners achievement gap (the achievement gap statistically related to language learners) language-learner achievement gap (the concept of an achievement gap associated with a non-specific language-learner) d
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