The messenger boy will runoff his legs sooner or later.
这个小通讯员迟早会累垮的。
《新英汉大辞典》
2
"My grandfather told me that the animal with the shortest legs has to run the farthest," she says, before rushing off to her next campaign appointment.
在奔往下一场竞选造势场合之前,她表示“阿公曾告诉我,腿愈短的动物必须跑得愈快”。
3
Back off on your mileage for a few days, and don't try to run through the pain. Give your legs a little time to mend.