factor/'fæktər $ -tər/

n. one of many things that affects a result

n. [C] 因素：[factor in sth] Too little exercise is a factor in the disease. 运动过少是引发这种疾病的一个病因。

◇a deciding factor 决定性因素

音组-actor/-æktər $ -ætər/

actor; factor; tractor