We now have a good demand for the captioned item and therefore write to you in the hope of establishing business relation.

我们现在需要标题所列的商品，为此特写信给你们，希望建立业务关系。

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These experiments contents have been used for 5 years, the total number of students joining the captioned experiments is beyond 2000, which leads to a pretty good teaching effect.

这些实验内容使用了5年，参加实验的学生人数达2000多人次，取得了良好的教学效果。

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