1. An electric arc is struck by contacting the electrodes.
   接触电极便击出电弧。
2. Joan of Arc was burned at the stake.
   圣女贞德被烧死在火刑柱上。
3. The secant of the complement of a directed angle or arc.
   余割有向角的余角或弧的余割
4. The chord AC subtends the arc ABC.
   弦AC正对弧ABC.。
5. the vivid arc of a rainbow.
   彩虹清晰的拱

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