contributors
A contributor is someone who gives money or resources to help pay for something or to help achieve a particular purpose.
Candidates for Congress received 53 per cent of their funds from individual contributors.
国会候选人接受的捐款中有53来自个人捐助者。
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.
Old buses are major contributors to pollution in cities.
旧公交车是造成城市污染的主要原因。