The pollution of secondary ions is the major influence factor for Xiaman air quality.
二次离子污染是影响厦门环境空气质量的主要因子。
The environment factor is secondary to them.
其次是环境因素。
The essence of secondary axial force and influential factor is presented.
阐述了预应力次轴力的本质，分析了影响次轴力的因素。
The essence of secondary axial force and influential factor is presented.
阐述了预应力次轴力的本质，分析了影响次轴力的因素。
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