意思不同
walk past走过；
walk by在…旁边走过；走过…；
侧重点不同
walk past侧重于已经从目标物走过了，越过了目标物。
walk by从物体旁边走过，没有越过目标物，在目标物旁边
But after two months he still couldn\'t walk by himself.
但是两个月之后，他仍然无法独立行走。
Who leave the right way, and walk by dark ways.
即那些离弃正道，走上黑暗之途。
She is in the way you pass by every day.
她长在你每天经过的路上。
