He was so slow that many thought him mentally retarded.
他迟钝得很,许多
以为他智力低下。
, 弱智
He was so slow that many thought him mentally retarded.
他迟钝得很,许多
以为他智力低下。
The problem of validity when tests are used in minority groups or for the educationally-mentally retarded.
Ⅱ、正确处理少数民族地区及弱智儿童测试工作中测验效度
问题。
The heavy rain retarded our progress.
大雨妨碍了我们
进展。
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