本次研究的虚无假设是催眠对于儿童的牙科治疗结果并无影响。
Null hypothesis: Hypnosis has no effect on the outcome of dental treatment of children.
现有进口牙科综合治疗椅7台，其中包括先进的儿童专用治疗椅2台。
Existing import dentistry complex therapy chair 7, including advanced child special-purpose treatment chair 2.
有过牙科治疗经历的儿童，易发生牙科畏惧症。
The children who had experienced dental therapy were prone to dental fear.
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