There is still a long way to go to achieve equal pay for men and women.

equal 是形容词，意思是"平等的、相等的"，指在数量、价值或地位上没有差别。 equal pay 指"同工同酬"，即相同工作应获得相同报酬的原则，强调不论性别都应获得公平的薪酬待遇。