步行上学的英文表达是 "walk to school"，它的来源是因为学校的地点离家近，不需要乘坐交通工具，而是通过步行前往学校。
例句：
I usually walk to school because it's good exercise and it's not too far from my house.
(我通常步行上学，因为这是很好的锻炼，并且学校离我家不算太远。)
My younger brother walks to school every day. He enjoys the fresh air and the peaceful environment.
(我的弟弟每天步行上学。他喜欢新鲜的空气和宁静的环境。)
It takes me 20 minutes to walk to school. I use this time to psten to music and clear my mind.
(步行上学需要我 20 分钟。我利用这段时间听音乐和清醒思维。)