1N-COUNT (尤指不愉快事件的)促成因素，原因之一 You can use contributor to refer to one of the causes of an event or situation, especially if that event or situation is an unpleasant one. (尤指不愉快事件的)促成因素，原因之一
Old buses are major contributors to pollution in British cities. [+ to]
破旧的公交车是造成英国城市污染的主要因素。
All this can lead to divisive family arguments to which guilt is a major contributor.