They walk up to the house, arms linked.

随后他们手挽手朝房屋走去。

Just walk up to someone, say "hi" and introduce yourself.

仅仅只是走向一个人，打个招呼然后介绍自己。

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。

In other words I don't just walk up to the dog and start to pet him.

换句话说，我不会随便的走过去开始抚拍它。

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。