Moldy and unclean tape can not be used, because it will wear head impact shooting.

有霉点和不洁净的磁带不能使用，因为其会磨损磁头，影响拍摄效果。

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Head on impact of airflow.

气流对霜层的正迎面撞击。

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Head impact injury study in China still is in its infancy.

头部损伤的生物力学研究在中国还是空白。

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Head impact injury study in China still is in its infancy.

头部损伤的生物力学研究在中国还是空白。

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