方法将297例患儿家长随机分为对照组和实验组，实施健康教育。
Methods 297 cases of children with parents were randomly pided into experimental group and control group, health education.
根系特征表现一样，但是实验组植株的茎长平均达到6 cm，对照组为3.5 cm。
The root systems were all the same, but the stems of the treated plants had an average length of 6cm, compared with 3.5cm for the untreated plants.
与对照组相比，实验组大鼠空间学习和记忆能力明显下降。
The spatial study and memory of the rats in study group significantly decreased compared with that of control group.
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