narrow white line的意思|示意

A person on tiptoe, in the narrow white line on the runway walk, walk away and go back.

一个人踮着脚尖，在窄窄的跑道白线上走，走到很远的地方又走回来。

Several times I got stuck behind a slow-moving truck on a narrow road with a solid white line on my left, and I was clinching my fists with impatience.

在狭窄的公路上，我的车几次被缓缓行驶的货车挡在后面，左侧是一条的白色线，急得我攥紧了拳头。