CONCLUSION: Durative of gymnastic movement, error of technical action and environmental factor are the main effect on the occurrence of avascular necrosis of the femoral head.
结论：体操运动训练的持续性、技术动作错误以及周围环境因素均是股骨头缺血性坏死伤病损发生的主要影响因素。
The effect of environmental air factor in the laying house on the productivity of layers in spring was studied in this paper.
本文研究了春季蛋鸡舍空气环境因素对伊莎蛋鸡生产性能的影响。
The environmental factors influenced the behavior of metastable pitting and stable pitting, of which the concentration of Br- and the general environmental factor had the remarkable effect.
研究表明，各环境因子对不锈钢稳态孔蚀及亚稳态孔蚀特征参数都有一定的影响，其中溴离子浓度和综合环境因子的影响作用比较显著。
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