随着年龄的增长，智力落后儿童的时距估计水平逐步提高。
MR children's ability of estimation of duration improved along with the growth of age.
学校、家庭、社区是智力落后儿童生活的三个主要生态环境。
Schools, families and communities are three main ecological environments in mentally retarded children's life.
但在智力落后儿童中开展奥尔夫乐器教学的训练，却很少见诸实践与运用的报导。
But there is few report on the practice and application of using Orff instruments in the training of mentally retarded children.
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