she was the first to cross the finishing line.她是第一个越过终点线.
she was the first to go across the finishing line.她是第一个穿过终点线.
across 是从一个平面的一端到另一端,强调平面
cross强调在三维立体的内部穿过.还有抽象的意义,如度过了某段时间等