One group of children had a strictly pedagogical introduction.
第一组孩子接受了一套严格的教学指导。
One group of children had a strictly pedagogical introduction.
按照严格的教学方法进行介绍给第一组孩子。
The control group was treated by same operation, but no ion introduction.
对照组大鼠给予相同的手术操作，但不导入铁离子。
For group discount, letter of introduction from your company is needed.
购团体票凭单位介绍信或团体证明。
For group discount, letter of introduction from your company is needed.
购团体票凭单位介绍信或团体证明。
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