1)Learn to walk before you run.,先学走，再学跑。2)Learn the walk before you run.,先学走，后学跑。3)Creep before you walk.,先学爬，再学走。4)You have to learn to walk before you can run.,奔跑之前必学走。5)A baby learning to walk;a horse walking around a riding ring.,学走路的婴儿;沿跑马圈慢跑的马6)chemical running-in,化学跑合
用法和例句
There are two reprocessed technologies after plasma arc quenching,they are lapped finishing and chemical running-in.