1.  by chance
2.  by coincidence

• 1. 碰巧: happen to | by chance | run into | by accident
• 2. 碰巧做: happen to do | sb. happens to do It so happens that | Do happen
• 3. 碰巧的: casual | hit-and-miss | chance unplanned | chancem

更多释义

• 1.我们碰巧发现我们有个共同的朋友。
  We happened to discover we had a friend in common.
  dict.yoduao.com
• 2.谁碰巧走过，她就冲谁叫骂。
  She snarled abuse at anyone who happened to walk past.
  dict.yoduao.com
• 3.你不会碰巧知道他的名字吧？
  You don't happen to know his name, do you?
  dict.yoduao.com

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