quick·sand /ˈkwɪkˌsænd/
 流沙,流沙地,危險狀態
 Quick·sand n. Sand easily moved or readily yielding to pressure; especially, a deep mass of loose or moving sand mixed with water, sometimes found at the mouth of a river or along some coasts, and very dangerous, from the difficulty of extricating a person who begins sinking into it.
    Life hath quicksands, -- Life hath snares!   --Longfellow.
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 quicksand
      n 1: a treacherous situation that tends to entrap and destroy
      2: a pit filled with loose wet sand into which objects are
         sucked down