intellectual development ruler
intellectual development ruler
智力发展标尺
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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After our years' research, we invent intellectual development ruler which has the advantages such as simple structure, low cost, easily distribution.
我们经过多年刻苦砖研，终于研制成功启智尺，它结构简单，造价低，便于推广。
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