He was so slow that many thought him mentally retarded.
他
钝得很,许多人以为他智力低下。
, 弱智钝He was so slow that many thought him mentally retarded.
他钝得很,许多人以为他智力低下。
The heavy rain retarded our progress.
大雨妨碍了我们
。
The problem of validity when tests are used in minority groups or for the educationally-mentally retarded.
Ⅱ、
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。
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。
