heel-and-toe

详细解释:a. 竞走的

详细解释：

heel-and-toe

adj.（形容词）
Characterized by a stride in which the heel of one foot touches ground before the toe of the other foot is lifted, as in walking races.
竞走的：特点为行走时一只脚之脚跟先着地，另一只脚之脚趾部才抬离地面，如竞走比赛之情形