It takes an hour or two to walk the Old City's ramparts, depending on how often you are stopped in your tracks by the views.

只消花一至两个小时即可行毕古城城墙，当然，实际需时视乎您沿途停步多久欣赏美景。

" To stop in your tracks" means to immediately stop what you are doing, to stop moving often because you are surprised or shocked.

“to stop in your tracks” 意思是立即停止你正在做的事情，经常因为你感到惊讶或震惊而停止移动。