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。
Head impact pull cans, should not hit the glass, do be patient.
用头撞击拉罐，不能撞到玻璃杯，千万要有耐心。
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。
Moldy and unclean tape can not be used, because it will wear head impact shooting.
有岑点和不沽净的磁带不能使用，因为其会磨杭峨头，影响拍摄效果。
气流对霜层的正迎面撞击。
气流对霜层的正迎面撞击。
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