The results showed : ( 1 ) peer group in 4-5 th graders was still in the initial formation stage, its density and centralization kept increasing with grade;

结果表明：（1）同伴团体在小学四、五年级尚处于初步形成期，其密度和中心势均随年级升高而提高；

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The results showed : ( 1 ) peer group in 4-5 th graders was still in the initial formation stage, its density and centralization kept increasing with grade;

结果表明：（1）同伴团体在小学四、五年级尚处于初步形成期，其密度和中心势均随年级升高而提高；

youdao