slackliner       
noun [ C ] uk/ˈslæk.laɪ.nər/ us/ˈslæk.laɪ.nɚ/
 走索者
a person who practises the sport of slacklining (= walking along a rope that is stretched above the ground between two points)
  This class is more technique-based, and covers advanced moves for experienced slackliners. 这门课更多地讲授技术,为经验丰富的走索人教授高级动作。 
 She is a professional slackliner and pulls off the most incredible tricks on the line. 她是一名专业的走索者,在绳索上展示了最不可思议的技巧。 
 See: slacklining
 - More examples
- The slackliner walked between two peaks on Mont Blanc in France.
- A professional slackliner performed an epic rescue at a Colorado ski resort.