单词：leave_no_stone_unturned 

动词

• 
  [1.v.leave_no_stone_unturned] (同义词:[leave_no_stone_unturned(v.千方百计, 想方设法 )]  )
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  注释列句：search thoroughly and exhaustively; "The police left no stone unturned in looking for the President's murderer"
• 上位词 -> [search( n. 搜寻, 查究 v. 搜索, 搜寻, 探求, 调查 )]