English to Chinese Other Education / Pedagogy

With the approval of the school district and a student's parents, a student who does not have limited English proficiency may also participate in a bilingual education program. The number of participating students who do not have limited English proficiency may not exceed 40 percent of the number of students enrolled in the program.

limited English proficiency 是什么意思？有限的英语能力，哪么does not have limited English proficiency 就是“没有有限的英语能力？”这样翻译不太顺。请赐教。