He was so slow that many thought him mentally retarded.
他迟钝得很,许多人以为他
低下。
)(
)发育迟缓
, 弱障；迟钝He was so slow that many thought him mentally retarded.
他迟钝得很,许多人以为他低下。
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
试工作中验效度
问题。
The heavy rain retarded our progress.
大雨妨碍了我们进展。
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