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。