a tightrope walker的用法和样例：
- At a circus, there is usually a tightrope walker.
- It is a question of being a tightrope walker or not.
- Like a tightrope walker on a high-wire, a Bateleur sways and rocks as it glides low above the tree tops.
- YIN MINGSHAN is a Chinese tightrope walker.
- The tightrope walker had us on tenterhooks until her reached the safety of the other side.