factorgen.手续费factorn.因素；因数；因子vt.把 ... 因素包括进去vi.作为因素factorial moment阶乘矩factor reversals要素反转factorial matrix阶乘矩阵factorial trials析因试验factor influence因素影响factors movement资源流动factor structure因子结构factorial ecology分解生态学Factors of danger危险因素factor reflection因子反应