It means never taking the car when you could walk; it means standing on short train and bus journeys, or walking at a pace where you feel you might break into a run if you were to go any faster.

• 可以步行时，绝对不要“以车代步”；乘短途火车和坐公交车时最好站着；快步走，以再快一点就会跑起来的速度走路。