儿童社交自我知觉和友谊质量的冲突背叛维度存在显著的年级差异。
There were significant grade difference on scores of self-perceived social competence and conflict and betrayal of friendship quality.
最后，重要的是认识到以人类正常的知觉可能难以辨别出环境之间的冲突，以致发现需要高精度的化学或者物理分析。
Finally, it is important to recognize that an environmental impact may not always be discernible by normal human perception so that detection may require sophisticated chemical or physical analysis.
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