In some cases, a young child can develop mental retardation after being sick with a serious infection or other illness, or after suffering a bad injury.
一些情况下，儿童在患了严重的传染病或者是其他疾病，或者是头部严重受伤之后，都会成为智力迟钝。
In some cases, a young child can develop mental retardation after being sick with a serious infection or other illness, or after suffering a bad injury.
一些情况下，儿童在患了严重的传染病或者是其他疾病，或者是头部严重受伤之后，都会成为智力迟钝。
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