单词	life buoy
释义	life buoyˈlife ˌbuoy noun [countable] a large ring that is made of material that floats, which you throw to someone who has fallen in the water, to prevent him or her from drowning
随便看	radio wave radish radium radius radon radula raffia raffish raffishness raffle raft rafter rafting rag raga ragamuffin ragbag rag doll rage ragged raggedly raggedness raggedy raging raglan

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