fencing  
noun [ U ] uk/ˈfen.sɪŋ/ us/ˈfen.sɪŋ/
  (STRUCTURE)      
  栅栏;篱笆;围栏;筑栅栏用的材料
fences, or the materials used to make fences
  wire/wooden fencing 铁丝网/木栅栏 
   (SPORT)      
 击剑运动
the sport of fighting with long, thin swords
  a fencing tournament/mask 击剑锦标赛/防护面罩 
 I did a little bit of fencing while I was at college. 上大学的时候我练过一点击剑。