合理控制自己的速度有助于避免马拉松比赛中的疲劳。

___Pacing yourself properly helps prevent exhaustion during a marathon.

马拉松跑者常常练习配速，以保持稳定的速度。

Marathon runners often practice ___pacing to maintain a steady speed.

小说的节奏恰到好处，既不会太快也不会太慢。

The novel's perfect ___pacing keeps it neither too fast nor too slow.

他在医院走廊里来回踱步，等待手术结果。

He was ___pacing in the hospital corridor while waiting for the surgery results.