沿着.
向下.他们都是沿着的意思。具体点，怎样使用？谢了go along 沿着（某条路）走go down下降，下去（以下是我引的）1.落下He got home before the sun went down. 太阳下山前他到了家。2.下降The price of eggs has gone down. 蛋价下降了。3.减弱The wind has gone down a little. 风势已减弱了一些。4.被记载This day will go down in history. 这一天将被记在历史上