1. trench arc and back-arc-basin system 
   沟弧盆系
2. Before re1easing the javelin，the competitor may not turn his or her back toward throwing arc. 
   标枪出手之前，身体不得完全转向背对投掷弧。
3. electric arc furnace steelmaking 
   电弧炉炼钢
4. gas shielded arc welding 
   气体保护电弧焊
5. shielded metal arc welding 
   手工电弧焊

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• 1. 持续性逆弧
  clear back 净里脊肉...consequential arc back 持续性逆弧...copy back 磁带复录
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