She completed three consecutive eight-yard sprints during practice.

eight-yard 是由数词 eight（八）和名词 yard（码）组成的复合形容词。yard 是英制长度单位，1码约等于0.9144米。 eight-yard 在这里用来修饰 sprints，表示"八码的"，指冲刺的距离是八码。