一清二白
      Explanation: Analogy is very clean. Metaphor is also very clear.
      Usage: Joint type; as predicate, attributive, complement; with commendatory
      Source: Mao Dun, "after the robbery theft by finding" four you do not believe me? Here I mixed the past six months, always a clear message on. "Zhou Libo," Storm "Part 7 My name is Han's bridge is the bridge, roads are roads, clear message on, afraid of to crooked I accomplished."
      Examples: We are a good one evil, only that day I remember the head master every day ~; surprise, Give us remember the poor bunch of good and evil was actually thin the God of retribution is flying!
      Results: Onion tofu
      Postscript: Onion tofu