lower their self-esteem and self-confidence
... students from their peers)，普通的孩子会觉得不公平(unfair), 降低自信和自尊(lower their self-esteem and self-confidence)聪明的儿童无法起到带头的作用(role models) 法：给聪明的儿童提供难道较高的选修课(optional class) >>>>> ..
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lower their self-esteem and self-confidence
降低他们的自尊和自信
以上为机器翻译结果，长、整句建议使用 人工翻译 。