Alan has made an immense contribution to the sport.艾伦为这项体育运动作出了巨大贡献。American economists have made important contributions to the field of financial and corporate economics.美国的经济学家们为金融学和企业经济学作出了巨大贡献。They contributed mightily to the cause.他们为这项事业做出了巨大贡献。