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。
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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