factor
/ˈfæktə(r); `fæktɚ/ n
1 fact, circumstance, etc that helps to produce a result 因素
environmental factors 环境因素
the factors that influenced my decision 影响我做出决定的因素
an unknown factor, ie sth unknown that is likely to influence a result 未知的因素（可能对结果造成影响的未知事物）.
2 (mathematics 数) number, except 1, by which a larger number can be divided exactly 因数; 因子
2, 3, 4 and 6 are factors of 12. 2、 3、 4、 6都是12的因数.
3 person or organization acting as a business agent （企业的）代理人, 代理商.
4 (Scot 苏格兰) land-agent; steward 地产经管人; 管家.