He was so slow that many thought him mentally retarded.
他迟钝得很,许多人以为他
力低下。
力)发育迟缓
, 弱
义词障；力迟钝He was so slow that many thought him mentally retarded.
他迟钝得很,许多人以为他力低下。
The problem of validity when tests are used in minority groups or for the educationally-mentally retarded.
Ⅱ、正确处理
族地区及弱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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