He claimed that the accident caused his injury, but the court ruled that he did not provide sufficient evidence of causation.他声称此次事故导致他受伤，但法院裁定他没有提供充分证据来证明其中的因果关系。The gene is only part of the causation of illness.基因只是一部分致病原因。The gene is only part of the causation of illness.基因只是致病的部分原因。