walk up to是指走向的意思。
例句：
The elevator was out of order and we had to walk up to the tenth floor.
电梯坏了。我们不得不徒步登上第十层楼。
As a teacher, we lost the naivete heart forever when we walk up to the platform.
作为教师。当我们走上讲台的那一课。我们就永远失去了学生时代的纯真心态。
I should be able to walk up to his front door.
我应该可以直接从他的前门进去。
If my son is being picked on I walk up to the situation and ask what the problem is.
如果是我的孩子被别人欺负了。我会走过去看看到底发生了什么。
All you have to do is walk up to a woman and introduce yourself.
所有您需要做的就是步行到一名女子及介绍自己。