Just as he was starting to gain on the last boy, his foot slipped again and he dropped to the track, rolling onto his side and groping blindly around him for balance.

• 正当他已开始接近跑在最后的人时，他的脚下又一打滑，再次倒在了轨道上，侧着身滚动着，并盲目地摸索着周围，以便保持平衡。